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Fujifilm GFX 100S vs Pentax 645Z

The Fujifilm GFX 100S and the Pentax 645Z are two professional cameras that were announced, respectively, in January 2021 and April 2014. The GFX 100S is a mirrorless interchangeable lens camera, while the 645Z is a DSLR. Both cameras are equipped with a medium format sensor. The Fujifilm has a resolution of 101.8 megapixels, whereas the Pentax provides 51.1 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Fujifilm GFX 100S
versus
Pentax 645Z
Fujifilm GFX 100S   Pentax 645Z
Mirrorless system camera Digital single lens reflex
Fujifilm G mount lenses Pentax 645 mount lenses
101.8 MP – Medium Format sensor 51.1 MP – Medium Format sensor
4K/30p Video 1080/60i Video
ISO 100-12,800 (50 - 102,400) ISO 100-204,800
Electronic viewfinder (3690k dots) Optical viewfinder
3.2" LCD – 2360k dots 3.2" LCD – 1037k dots
Fully flexible touchscreen Tilting screen (no touchscreen)
5 shutter flaps per second 3 shutter flaps per second
In-body stabilizationLens stabilization only
Weathersealed bodyWeathersealed body
460 shots per battery charge650 shots per battery charge
150 x 104 x 87 mm, 900 g 156 x 117 x 123 mm, 1550 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm GFX 100S and the Pentax 645Z? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

An illustration of the physical size and weight of the Fujifilm GFX 100S and the Pentax 645Z is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Fujifilm GFX 100S vs Pentax 645Z
Compare GFX 100S versus 645Z top
Comparison GFX 100S or 645Z rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645Z is notably larger (17 percent) than the Fujifilm GFX 100S. Moreover, the 645Z is substantially heavier (72 percent) than the GFX 100S. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the GFX 100S gets 460 shots out of its Fujifilm NP-W235 battery, while the 645Z can take 650 images on a single charge of its Pentax D-LI90 power pack. The power pack in the GFX 100S can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm GFX 100S 150 mm 104 mm 87 mm 900 g 460 Y Jan 2021 5,999 amazon.com
2.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.com
3.
 
Canon R3 150 mm 143 mm 87 mm 1015 g 760 Y Sep 2021 5,999 amazon.com
4.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
5.
 
Canon 5DS R 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
6.
 
Fujifilm GFX 100 II 152 mm 117 mm 99 mm 1030 g 540 Y Sep 2023 7,499 amazon.com
7.
 
Fujifilm GFX 50S II 150 mm 104 mm 87 mm 900 g 440 Y Sep 2021 3,999 amazon.com
8.
 
Fujifilm GFX 100 156 mm 144 mm 75 mm 1320 g 800 Y May 2019 9,999ebay.com
9.
 
Fujifilm GFX 50R 161 mm 97 mm 66 mm 775 g 400 Y Sep 2018 4,499ebay.com
10.
 
Fujifilm GFX 50S 148 mm 94 mm 91 mm 740 g 400 Y Sep 2016 6,499ebay.com
11.
 
Hasselblad X2D 100C 149 mm 106 mm 75 mm 895 g 420 Y Sep 2022 8,199 amazon.com
12.
 
Hasselblad X1D II 148 mm 97 mm 70 mm 766 g .. Y Jun 2019 5,750ebay.com
13.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995ebay.com
14.
 
Leica SL2 146 mm 107 mm 42 mm 953 g 370 Y Nov 2019 5,999 amazon.com
15.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450ebay.com
16.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
17.
 
Sony A1 129 mm 97 mm 81 mm 737 g 530 Y Jan 2021 6,499 amazon.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will obviously take relative prices into account. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The GFX 100S was launched at a markedly lower price (by 29 percent) than the 645Z, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature a medium format sensor, but their sensors differ slightly in size. They nevertheless have the same format factor of 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Fujifilm GFX 100S and Pentax 645Z sensor measures

With 101.8MP, the GFX 100S offers a higher resolution than the 645Z (51.1MP), but the GFX 100S has smaller individual pixels (pixel pitch of 3.76μm versus 5.30μm for the 645Z). However, the GFX 100S is a much more recent model (by 6 years and 9 months) than the 645Z, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Fujifilm GFX 100S implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GFX 100S for good quality output (200 dots per inch) amounts to 58.2 x 43.7 inches or 147.9 x 110.9 cm, for very good quality (250 dpi) 46.6 x 34.9 inches or 118.3 x 88.8 cm, and for excellent quality (300 dpi) 38.8 x 29.1 inches or 98.6 x 74 cm. The corresponding values for the Pentax 645Z are 41.3 x 31 inches or 104.9 x 78.6 cm for good quality, 33 x 24.8 inches or 83.9 x 62.9 cm for very good quality, and 27.5 x 20.6 inches or 69.9 x 52.4 cm for excellent quality prints.

The GFX 100S has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the 645Z, the GFX 100S has the capacity to capture high quality composite images (YESMP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Fujifilm GFX 100S has a native sensitivity range from ISO 100 to ISO 12800, which can be extended to ISO 50-102400. The corresponding ISO settings for the Pentax 645Z are ISO 100 to ISO 204800 (no boost).

In terms of underlying technology, the GFX 100S is build around a BSI-CMOS sensor, while the 645Z uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

GFX 100S versus 645Z MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Fujifilm GFX 100S Medium Format 101.8 11648 87364K/30p25.814.73391100
2.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
3.
 
Canon R3 Full Frame 24.0 6000 40006K/60p25.014.7408696
4.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
5.
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886
6.
 
Fujifilm GFX 100 II Medium Format 101.8 11648 87368K/30p25.915.03651101
7.
 
Fujifilm GFX 50S II Medium Format 51.1 8256 61921080/30p25.914.83456100
8.
 
Fujifilm GFX 100 Medium Format 101.8 11648 87364K/30p25.714.5322799
9.
 
Fujifilm GFX 50R Medium Format 51.1 8256 61921080/30p25.714.4316998
10.
 
Fujifilm GFX 50S Medium Format 51.1 8256 61921080/30p25.414.1297796
11.
 
Hasselblad X2D 100C Medium Format 102.1 11656 8762none25.914.93550101
12.
 
Hasselblad X1D II Medium Format 51.3 8272 62001080/25p25.714.5323499
13.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
14.
 
Leica SL2 Full Frame 46.7 8368 55844K/60p25.314.3286695
15.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
16.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
17.
 
Sony A1 Full Frame 49.8 8640 57608k/30p25.914.5316398
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the GFX 100S provides a higher video resolution than the 645Z. It can shoot video footage at 4K/30p, while the Pentax is limited to 1080/60i.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the GFX 100S has an electronic viewfinder (3690k dots), while the 645Z has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinder in the GFX 100S offers a wider field of view (100%) than the one in the 645Z (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645Z has a higher magnification (0.78x vs 0.77x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Fujifilm GFX 100S, the Pentax 645Z, and comparable cameras.

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Core Features
# image Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Fujifilm GFX 100S3690 Y3.2 / 2360 full-flex Y 1/4000s 5.0/s n Y
2.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
3.
 
Canon R35760 Y3.2 / 4150 swivel Y 1/8000s 12.0/s n Y
4.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
5.
 
Canon 5DS Roptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
6.
 
Fujifilm GFX 100 II9440 Y3.2 / 2360 full-flex Y 1/4000s 8.0/s n Y
7.
 
Fujifilm GFX 50S II3690 Y3.2 / 2360 full-flex Y 1/4000s 3.0/s n Y
8.
 
Fujifilm GFX 100optional Y3.2 / 2360 full-flex Y 1/4000s 5.0/s n Y
9.
 
Fujifilm GFX 50R3690 n3.2 / 2360 tilting Y 1/4000s 3.0/s n n
10.
 
Fujifilm GFX 50Soptional Y3.2 / 2360 full-flex Y 1/4000s 3.0/s n n
11.
 
Hasselblad X2D 100C5760 Y3.6 / 2360 tilting Y 1/4000s 3.3/s n Y
12.
 
Hasselblad X1D II3690 n3.6 / 2360 fixed Y 1/2000s 2.7/s n n
13.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3/s n n
14.
 
Leica SL25760 Y3.2 / 2100 fixed Y 1/8000s 10.0/s n Y
15.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0/s n n
16.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
17.
 
Sony A19437 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One feature that differentiates the GFX 100S and the 645Z is in-body image stabilization (IBIS). The GFX 100S reduces the risk of handshake-induced blur with all attached lenses, while the 645Z offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the GFX 100S is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Fujifilm GFX 100S and the Pentax 645Z both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the GFX 100S and the 645Z write their files to SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The GFX 100S supports UHS-II cards (on both slots), while the 645Z can use UHS-I cards.

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Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Fujifilm GFX 100S and Pentax 645Z and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Fujifilm GFX 100SYstereo / monoYYmicro3.2Y-Y
2.
 
Pentax 645ZYstereo / monoY-mini3.0---
3.
 
Canon R3Ystereo / monoYYmicro3.2Y-Y
4.
 
Canon 5DSYmono / monoY-mini3.0---
5.
 
Canon 5DS RYmono / monoY-mini3.0---
6.
 
Fujifilm GFX 100 IIYstereo / monoYYfull3.2Y-Y
7.
 
Fujifilm GFX 50S IIYstereo / monoYYmicro3.2Y--
8.
 
Fujifilm GFX 100Ystereo / monoYYmicro3.1Y-Y
9.
 
Fujifilm GFX 50RYstereo / monoYYmicro3.0Y-Y
10.
 
Fujifilm GFX 50SYstereo / monoYYmicro3.0Y--
11.
 
Hasselblad X2D 100CYstereo / mono---3.2Y--
12.
 
Hasselblad X1D IIYstereo / monoYY-3.0Y--
13.
 
Hasselblad X1DYstereo / monoYYmini3.0Y--
14.
 
Leica SL2Ystereo / monoYYfull3.1Y-Y
15.
 
Leica SLYstereo / monoYYfull3.0Y--
16.
 
Pentax 645DYstereo / ----2.0---
17.
 
Sony A1Ystereo / monoYYfull3.2Y-Y
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It is notable that the GFX 100S has a headphone jack, which is not present on the 645Z This port makes it possible to attach external headphones and monitor the quality of sound during the recording process.

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

The GFX 100S is a recent model that features in the current product line-up of Fujifilm. In contrast, the 645Z has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the 645Z from Pentax. Further information on the features and operation of the GFX 100S and 645Z can be found, respectively, in the Fujifilm GFX 100S Manual (free pdf) or the online Pentax 645Z Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Fujifilm GFX 100S or the Pentax 645Z – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

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Arguments in favor of the Fujifilm GFX 100S:

  • More detail: Offers more megapixels (101.8 vs 51.1MP) with a 41% higher linear resolution.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/60i).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
  • More detailed LCD: Has a higher resolution rear screen (2360k vs 1037k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster burst: Shoots at higher frequency (5 vs 3 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (150x104mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 650g or 42 percent) and hence easier to carry around.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Sharper images: Has hand-shake reducing image stabilization built-in.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More affordable: Was introduced into a lower priced category (29 percent cheaper at launch).
  • More modern: Reflects 6 years and 9 months of technical progress since the 645Z launch.

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Reasons to prefer the Pentax 645Z:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.77x).
  • Longer lasting: Gets more shots (650 versus 460) out of a single battery charge.
  • More heavily discounted: Has been around for much longer (launched in April 2014).

If the number of relative strengths (bullet points above) is taken as a guide, the GFX 100S is the clear winner of the match-up (22 : 4 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

GFX 100S 22:04 645Z

How about other alternatives? Do the specifications of the Fujifilm GFX 100S and the Pentax 645Z place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the GFX 100S and the 645Z in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm GFX 100S5/5+ +5/590/1005/55/5 Jan 2021 5,999 amazon.com
2.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 8,499ebay.com
3.
 
Canon R35/5o4.5/5..5/54.5/5 Sep 2021 5,999 amazon.com
4.
 
Canon 5DS..+..83/1004.5/54.5/5 Feb 2015 3,699ebay.com
5.
 
Canon 5DS R5/5+..83/1005/54.5/5 Feb 2015 3,699ebay.com
6.
 
Fujifilm GFX 100 II5/5+5/5....4.5/5 Sep 2023 7,499 amazon.com
7.
 
Fujifilm GFX 50S II5/5..5/587/100..5/5 Sep 2021 3,999 amazon.com
8.
 
Fujifilm GFX 1004.5/5+ +4.8/590/1005/54.5/5 May 2019 9,999ebay.com
9.
 
Fujifilm GFX 50R5/5..5/584/1004.5/54.5/5 Sep 2018 4,499ebay.com
10.
 
Fujifilm GFX 50S....4.5/585/1005/54.5/5 Sep 2016 6,499ebay.com
11.
 
Hasselblad X2D 100C4/5..5/5...... Sep 2022 8,199 amazon.com
12.
 
Hasselblad X1D II....4/5..4/54/5 Jun 2019 5,750ebay.com
13.
 
Hasselblad X1D..o..81/100..4/5 Jun 2016 8,995ebay.com
14.
 
Leica SL24/5..4.5/5..4.5/54/5 Nov 2019 5,999 amazon.com
15.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450ebay.com
16.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
17.
 
Sony A15/5o4.5/593/1004.5/55/5 Jan 2021 6,499 amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Fujifilm GFX 100S vs Pentax 645Z

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Fujifilm GFX 100S Pentax 645Z
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Fujifilm G mount lenses Pentax 645 mount lenses
    Launch Date January 2021 April 2014
    Launch Price USD 5,999 USD 8,499
    Sensor Specs Fujifilm GFX 100S Pentax 645Z
    Sensor Technology BSI-CMOS CMOS
    Sensor Format Medium Format Sensor Medium Format Sensor
    Sensor Size 43.8 x 32.9 mm 43.8 x 32.8 mm
    Sensor Area 1441.02 mm2 1436.64 mm2
    Sensor Diagonal 54.8 mm 54.7 mm
    Crop Factor 0.79x 0.79x
    Sensor Resolution 101.8 Megapixels 51.1 Megapixels
    Image Resolution 11648 x 8736 pixels 8256 x 6192 pixels
    Pixel Pitch 3.76 μm 5.30 μm
    Pixel Density 7.06 MP/cm2 3.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 1080/60i Video
    ISO Setting 100 - 12,800 ISO 100 - 204,800 ISO
    ISO Boost 50 - 102,400 ISO no Enhancement
    Image Processor X-Processor 4 PRIME III
    DXO Sensor Quality (score) .. 101
    DXO Color Depth (bits) .. 26.0
    DXO Dynamic Range (EV) .. 14.7
    DXO Low Light (ISO) .. 4505
    Screen Specs Fujifilm GFX 100S Pentax 645Z
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 98%
    Viewfinder Magnification 0.77x 0.78x
    Viewfinder Resolution 3690k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 3.2inch
    LCD Resolution 2360k dots 1037k dots
    LCD Attachment Fully flexible screen Tilting screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Fujifilm GFX 100S Pentax 645Z
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/4000s
    Continuous Shooting 5 shutter flaps/s 3 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationIn-body stabilizationLens stabilization only
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Dual card slots Dual card slots
    UHS card support Dual UHS-II UHS-I
    Connectivity Specs Fujifilm GFX 100S Pentax 645Z
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 3.2 USB 3.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port no Headphone port
    Wifi Support Wifi built-in no Wifi
    Bluetooth Support Bluetooth built-in no Bluetooth
    Body Specs Fujifilm GFX 100S Pentax 645Z
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Fujifilm NP-W235 Pentax D-LI90
    Battery Life (CIPA)460 shots per charge650 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 150 x 104 x 87 mm
    (5.9 x 4.1 x 3.4 in)
    156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    Camera Weight 900 g (31.7 oz) 1550 g (54.7 oz)
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