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Sony A7S II vs Panasonic GX8

The Sony Alpha 7S II and the Panasonic Lumix DMC-GX8 are two digital cameras that were announced, respectively, in September 2015 and July 2015. Both the A7S II and the GX8 are mirrorless interchangeable lens cameras that are based on a full frame (A7S II) and a Four Thirds (GX8) sensor. The Sony has a resolution of 12 megapixels, whereas the Panasonic provides 20.2 MP.

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

Headline Specifications
Sony A7S II
versus
Panasonic GX8
Sony A7S II   Panasonic GX8
Mirrorless system camera Mirrorless system camera
Sony E mount lenses Micro Four Thirds lenses
12 MP – Full Frame sensor 20.2 MP – Four Thirds sensor
4K/30p Video 4K/30p Video
ISO 100-102,400 (50 - 409,600) ISO 200-25,600
Electronic viewfinder (2400k dots) Electronic viewfinder (2360k dots)
3.0" LCD – 1229k dots 3.0" LCD – 1040k dots
Tilting screen (no touchscreen) Swivel touchscreen
5 shutter flaps per second 10 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
370 shots per battery charge330 shots per battery charge
127 x 96 x 60 mm, 627 g 133 x 78 x 63 mm, 487 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha 7S II and the Panasonic Lumix DMC-GX8? 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

The side-by-side display below illustrates the physical size and weight of the Sony A7S II and the Panasonic GX8. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.

The GX8 can be obtained in two different colors (black, silver), while the A7S II is only available in black.

Size Sony A7S II vs Panasonic GX8
Compare A7S II versus GX8 top
Comparison A7S II or GX8 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Panasonic GX8 is notably smaller (15 percent) than the Sony A7S II. Moreover, the GX8 is markedly lighter (22 percent) than the A7S II. 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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Sony FE Lens Catalog (A7S II) and the Micro Four Thirds Lens Catalog (GX8). Mirrorless cameras, such as the two under consideration, have the additional advantage of having a short flange to focal plane distance, which makes it possible to mount many lenses from other systems onto the camera via adapters.

Concerning battery life, the A7S II gets 370 shots out of its Sony NP-FW50 battery, while the GX8 can take 330 images on a single charge of its Panasonic DMW-BLC12 power pack. The power pack in the A7S II can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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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.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999ebay.com
2.
 
Panasonic GX8 133 mm 78 mm 63 mm 487 g 330 Y Jul 2015 1,199ebay.com
3.
 
Olympus E-M5 II 124 mm 85 mm 45 mm 469 g 310 Y Feb 2015 1,099ebay.com
4.
 
Olympus E-M1 130 mm 94 mm 63 mm 497 g 350 Y Sep 2013 1,399ebay.com
5.
 
Panasonic G95 130 mm 94 mm 77 mm 536 g 290 Y Apr 2019 999ebay.com
6.
 
Panasonic GX9 124 mm 72 mm 47 mm 407 g 260 n Feb 2018 849ebay.com
7.
 
Panasonic GX7 123 mm 71 mm 55 mm 402 g 350 n Aug 2013 999ebay.com
8.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 Y Oct 2021 2,499 amazon.com
9.
 
Sony A7R IIIA 127 mm 96 mm 74 mm 650 g 650 Y Apr 2021 3,199 amazon.com
10.
 
Sony A7R IVA 129 mm 96 mm 78 mm 665 g 670 Y Apr 2021 3,499 amazon.com
11.
 
Sony A7S III 127 mm 97 mm 81 mm 699 g 600 Y Jul 2020 3,499 amazon.com
12.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499ebay.com
13.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199ebay.com
14.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199ebay.com
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199ebay.com
16.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
17.
 
Sony A7S 127 mm 94 mm 48 mm 489 g 380 Y Apr 2014 2,499ebay.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 GX8 was launched at a markedly lower price (by 60 percent) than the A7S II, 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.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Sony A7S II features a full frame sensor and the Panasonic GX8 a Four Thirds sensor. The sensor area in the GX8 is 73 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 2.0. The sensor in the A7S II has a native 3:2 aspect ratio, while the one in the GX8 offers a 4:3 aspect.

Sony A7S II and Panasonic GX8 sensor measures

Despite having a smaller sensor, the GX8 offers a higher resolution of 20.2 megapixels, compared with 12 MP of the A7S II. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.34μm versus 8.40μm for the A7S II). It is noteworthy in this context that the two cameras were released in close succession, so that their sensors are from the same technological generation.

The resolution advantage of the Panasonic GX8 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GX8 for good quality output (200 dots per inch) amounts to 25.9 x 19.4 inches or 65.8 x 49.4 cm, for very good quality (250 dpi) 20.7 x 15.6 inches or 52.7 x 39.5 cm, and for excellent quality (300 dpi) 17.3 x 13 inches or 43.9 x 32.9 cm. The corresponding values for the Sony A7S II are 21.2 x 14.2 inches or 53.8 x 36 cm for good quality, 17 x 11.3 inches or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inches or 35.9 x 24 cm for excellent quality prints.

The Sony Alpha 7S II has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 50-409600. The corresponding ISO settings for the Panasonic Lumix DMC-GX8 are ISO 200 to ISO 25600, with the possibility to increase the ISO range to 100-25600.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

A7S II versus GX8 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under review, the A7S II has a notably higher overall DXO score than the GX8 (overall score 10 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.1 bits higher color depth, 0.7 EV in additional dynamic range, and 1.9 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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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.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.3299385
2.
 
Panasonic GX8 Four Thirds 20.2 5184 38884K/30p23.512.680675
3.
 
Olympus E-M5 II Four Thirds 15.9 4608 34561080/60p23.012.584273
4.
 
Olympus E-M1 Four Thirds 15.9 4608 34561080/30p23.012.775773
5.
 
Panasonic G95 Four Thirds 20.2 5184 38884K/30p23.213.0127375
6.
 
Panasonic GX9 Four Thirds 20.2 5184 38884K/30p23.112.8116374
7.
 
Panasonic GX7 Four Thirds 15.8 4592 34481080/60p22.612.271870
8.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
9.
 
Sony A7R IIIA Full Frame 42.2 7952 53044K/30p26.014.73523100
10.
 
Sony A7R IVA Full Frame 60.2 9504 63364K/30p26.014.8334499
11.
 
Sony A7S III Full Frame 12.0 4240 28324K/120p23.713.9252086
12.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
13.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
14.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
15.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
16.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
17.
 
Sony A7S Full Frame 12.0 4240 28321080/60p23.913.2370287
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, and both provide the same movie specifications (4K/30p).

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under consideration are similar with respect to both having an electronic viewfinder. However, the one in the A7S II offers a slightly higher resolution than the one in the GX8 (2400k vs 2360k dots). The adjacent table lists some of the other core features of the Sony A7S II and Panasonic GX8 along with similar information for a selection of comparators.

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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.
 
Sony A7S II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
2.
 
Panasonic GX82360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
3.
 
Olympus E-M5 II2360 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
4.
 
Olympus E-M12360 n3.0 / 1037 tilting Y 1/8000s 10.0/s n Y
5.
 
Panasonic G952360 n3.0 / 1240 swivel Y 1/4000s 9.0/s Y Y
6.
 
Panasonic GX92760 n3.0 / 1240 tilting Y 1/4000s 9.0/s Y Y
7.
 
Panasonic GX72760 n3.0 / 1040 tilting Y 1/8000s 5.0/s Y Y
8.
 
Sony A7 IV3686 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
9.
 
Sony A7R IIIA3686 n3.0 / 2340 tilting Y 1/8000s 10.0/s n Y
10.
 
Sony A7R IVA5760 n3.0 / 2340 tilting Y 1/8000s 10.0/s n Y
11.
 
Sony A7S III9440 n3.0 / 1440 swivel Y 1/8000s 10.0/s n Y
12.
 
Sony A7R IV5760 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
13.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
14.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
15.
 
Sony A7R II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
16.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
17.
 
Sony A7S2400 n3.0 / 921 tilting n 1/8000s 5.0/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The GX8 has a touchscreen, while the A7S II has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The GX8 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the A7S II does not have a selfie-screen.

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, both cameras under consideration feature an 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 Panasonic GX8 has 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.

The A7S II writes its imaging data to SDXC or Memory Stick PRO Duo cards, while the GX8 uses SDXC cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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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 Sony Alpha 7S II and Panasonic Lumix DMC-GX8 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.
 
Sony A7S IIYstereo / monoYYmicro2.0YY-
2.
 
Panasonic GX8Ystereo / monoY-micro2.0YY-
3.
 
Olympus E-M5 IIYstereo / monoY-micro2.0Y--
4.
 
Olympus E-M1Ystereo / monoY-micro2.0Y--
5.
 
Panasonic G95Ystereo / monoYYmicro2.0Y-Y
6.
 
Panasonic GX9Ystereo / mono--micro2.0Y-Y
7.
 
Panasonic GX7Ystereo / mono--mini2.0YY-
8.
 
Sony A7 IVYstereo / monoYYfull3.2Y-Y
9.
 
Sony A7R IIIAYstereo / monoYYmicro3.2YYY
10.
 
Sony A7R IVAYstereo / monoYYmicro3.2YYY
11.
 
Sony A7S IIIYstereo / monoYYfull3.2Y-Y
12.
 
Sony A7R IVYstereo / monoYYmicro3.1YYY
13.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
14.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
15.
 
Sony A7R IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
17.
 
Sony A7SYstereo / monoYYmicro2.0YY-
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It is notable that the A7S II has a headphone jack, which is not present on the GX8 This port makes it possible to attach external headphones and monitor the quality of sound during the recording process.

Both the A7S II and the GX8 have been discontinued, but can regularly be found used on ebay. The GX8 was replaced by the Panasonic GX9, while the A7S II was followed by the Sony A7S III. Further information on the features and operation of the A7S II and GX8 can be found, respectively, in the Sony A7S II Manual (free pdf) or the online Panasonic GX8 Manual.

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Review summary

So how do things add up? Which of the two cameras – the Sony A7S II or the Panasonic GX8 – 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 Sony Alpha 7S II:

  • Better image quality: Scores markedly higher (10 points) in the DXO overall assessment.
  • More dynamic range: Captures a larger spectrum of light and dark details (0.7 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (1.9 stops ISO advantage).
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.77x).
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 1040k dots).
  • Longer lasting: Can take more shots (370 versus 330) on a single battery charge.
  • Easier travel charging: Can be conveniently charged via its USB port.

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Advantages of the Panasonic Lumix DMC-GX8:

  • More detail: Has more megapixels (20.2 vs 12MP), which boosts linear resolution by 27%.
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (10 vs 5 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More compact: Is smaller (133x78mm vs 127x96mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 140g or 22 percent) and is thus easier to take along.
  • More affordable: Was introduced into a lower priced category (60 percent cheaper at launch).

If the count of individual advantages (bullet points above) is taken as a guide, the GX8 comes out slightly ahead of the A7S II (9 : 8 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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.

A7S II 08:09 GX8

How about other alternatives? Do the specifications of the Sony A7S II and the Panasonic GX8 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing whether the two cameras rank among the cream of the crop.

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the A7S II or the GX8. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular camera 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.
 
Sony A7S II5/5+....4.5/55/5 Sep 2015 2,999ebay.com
2.
 
Panasonic GX85/5+..82/1004.5/54.5/5 Jul 2015 1,199ebay.com
3.
 
Olympus E-M5 II5/5+ +4.5/581/1005/55/5 Feb 2015 1,099ebay.com
4.
 
Olympus E-M15/5+ +..84/1004.5/54.5/5 Sep 2013 1,399ebay.com
5.
 
Panasonic G954.5/5+4.5/583/1004.5/54.5/5 Apr 2019 999ebay.com
6.
 
Panasonic GX94/5+4/584/1004.5/54.5/5 Feb 2018 849ebay.com
7.
 
Panasonic GX74/5+..79/1005/55/5 Aug 2013 999ebay.com
8.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 2,499 amazon.com
9.
 
Sony A7R IIIA..+ +4/590/1004.5/55/5 Apr 2021 3,199 amazon.com
10.
 
Sony A7R IVA5/5+4.5/591/1004.5/55/5 Apr 2021 3,499 amazon.com
11.
 
Sony A7S III4.5/5+ +5/591/1004.5/55/5 Jul 2020 3,499 amazon.com
12.
 
Sony A7R IV5/5+4.5/591/1004.5/55/5 Jul 2019 3,499ebay.com
13.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199ebay.com
14.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 3,199ebay.com
15.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 3,199ebay.com
16.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
17.
 
Sony A7S4/5....86/1004.5/55/5 Apr 2014 2,499ebay.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. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Sony A7S II vs Panasonic GX8

    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 Sony A7S II Panasonic GX8
    Camera Type Mirrorless system camera Mirrorless system camera
    Camera Lens Sony E mount lenses Micro Four Thirds lenses
    Launch Date September 2015 July 2015
    Launch Price USD 2,999 USD 1,199
    Sensor Specs Sony A7S II Panasonic GX8
    Sensor Technology CMOS CMOS
    Sensor Format Full Frame Sensor Four Thirds Sensor
    Sensor Size 35.6 x 23.8 mm 17.3 x 13.0 mm
    Sensor Area 847.28 mm2 224.9 mm2
    Sensor Diagonal 42.8 mm 21.6 mm
    Crop Factor 1.0x 2.0x
    Sensor Resolution 12 Megapixels 20.2 Megapixels
    Image Resolution 4240 x 2832 pixels 5184 x 3888 pixels
    Pixel Pitch 8.40 μm 3.34 μm
    Pixel Density 1.42 MP/cm2 8.96 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 4K/30p Video 4K/30p Video
    ISO Setting 100 - 102,400 ISO 200 - 25,600 ISO
    ISO Boost 50 - 409,600 ISO 100 - 25,600 ISO
    Image Processor BIONZ X Venus
    DXO Sensor Quality (score) 85 75
    DXO Color Depth (bits) 23.6 23.5
    DXO Dynamic Range (EV) 13.3 12.6
    DXO Low Light (ISO) 2993 806
    Screen Specs Sony A7S II Panasonic GX8
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.78x 0.77x
    Viewfinder Resolution 2400k dots 2360k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1229k dots 1040k dots
    LCD Attachment Tilting screen Swivel screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Sony A7S II Panasonic GX8
    Focus System Contrast-detect AF Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 5 shutter flaps/s 10 shutter flaps/s
    Electronic ShutterYESup to 1/16000s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium MS or SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Sony A7S II Panasonic GX8
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI micro HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port no Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Near-Field Communication NFC built-in NFC built-in
    Body Specs Sony A7S II Panasonic GX8
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Sony NP-FW50 Panasonic DMW-BLC12
    Battery Life (CIPA)370 shots per charge330 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 127 x 96 x 60 mm
    (5.0 x 3.8 x 2.4 in)
    133 x 78 x 63 mm
    (5.2 x 3.1 x 2.5 in)
    Camera Weight 627 g (22.1 oz) 487 g (17.2 oz)
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