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Olympus E-M1 III vs Sony A7 IV

The Olympus OM-D E-M1 Mark III and the Sony Alpha A7 IV are two enthusiast cameras that were officially introduced, respectively, in February 2020 and October 2021. Both the E-M1 III and the A7 IV are mirrorless interchangeable lens cameras that are based on a Four Thirds (E-M1 III) and a full frame (A7 IV) sensor. The Olympus has a resolution of 20.2 megapixels, whereas the Sony provides 32.7 MP.

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

Headline Specifications
Olympus E-M1 III
versus
Sony A7 IV
Olympus E-M1 III   Sony A7 IV
Mirrorless system camera Mirrorless system camera
Micro Four Thirds lenses Sony E mount lenses
20.2 MP – Four Thirds sensor 32.7 MP – Full Frame sensor
4K/30p Video 4K/60p Video
ISO 200-25,600 ISO 100-51,200 (50 - 204,800)
Electronic viewfinder (2360k dots) Electronic viewfinder (3686k dots)
3.0" LCD – 1037k dots 3.0" LCD – 1037k dots
Swivel touchscreen Swivel touchscreen
18 shutter flaps per second 10 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
420 shots per battery charge580 shots per battery charge
134 x 91 x 69 mm, 580 g 131 x 96 x 80 mm, 659 g
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Check E-M1 III price at
amazon.com
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Check A7 IV price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus OM-D E-M1 Mark III and the Sony Alpha A7 IV? 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.

Body comparison

The physical size and weight of the Olympus E-M1 III and the Sony A7 IV are illustrated 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 Olympus E-M1 III vs Sony A7 IV
Compare E-M1 III versus A7 IV top
Comparison E-M1 III or A7 IV rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 IV is somewhat larger (3 percent) than the Olympus E-M1 III. Moreover, the A7 IV is markedly heavier (14 percent) than the E-M1 III. 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 Micro Four Thirds Lens Catalog (E-M1 III) and the Sony FE Lens Catalog (A7 IV). 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 E-M1 III gets 420 shots out of its BLH-1 battery, while the A7 IV can take 580 images on a single charge of its NP-FZ100 power pack. The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Olympus E-M1 III 134 mm 91 mm 69 mm 580 g 420 Y Feb 2020 1,799 amazon.com
2.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 Y Oct 2021 2,499 amazon.com
3.
 
Olympus E-M5 III 125 mm 85 mm 50 mm 414 g 310 Y Oct 2019 1,199 amazon.com
4.
 
Olympus E-M1X 144 mm 147 mm 75 mm 997 g 870 Y Jan 2019 2,999 amazon.com
5.
 
Olympus E-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 1,999ebay.com
6.
 
Olympus E-M1 130 mm 94 mm 63 mm 497 g 350 Y Sep 2013 1,399ebay.com
7.
 
OM System OM-1 135 mm 92 mm 73 mm 599 g 520 Y Feb 2022 2,199 amazon.com
8.
 
Panasonic GH5 II 139 mm 98 mm 87 mm 727 g 400 Y May 2021 1,699 amazon.com
9.
 
Panasonic G95 130 mm 94 mm 77 mm 536 g 290 Y Apr 2019 999 amazon.com
10.
 
Panasonic G9 137 mm 97 mm 92 mm 658 g 400 Y Nov 2017 1,699 amazon.com
11.
 
Panasonic GH5 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 1,999ebay.com
12.
 
Panasonic GX8 133 mm 78 mm 63 mm 487 g 330 Y Jul 2015 1,199ebay.com
13.
 
Sony A9 II 129 mm 96 mm 76 mm 678 g 690 Y Oct 2019 4,499 amazon.com
14.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499 amazon.com
15.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 amazon.com
16.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199ebay.com
17.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

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 E-M1 III was launched at a markedly lower price (by 28 percent) than the A7 IV, 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 imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Olympus E-M1 III features a Four Thirds sensor and the Sony A7 IV a full frame sensor. The sensor area in the A7 IV is 281 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.0. The sensor in the E-M1 III has a native 4:3 aspect ratio, while the one in the A7 IV offers a 3:2 aspect.

Olympus E-M1 III and Sony A7 IV sensor measures

With 32.7MP, the A7 IV offers a higher resolution than the E-M1 III (20.2MP), but the A7 IV nevertheless has larger individual pixels (pixel pitch of 5.12μm versus 3.34μm for the E-M1 III) due to its larger sensor. Moreover, the A7 IV is a somewhat more recent model (by 1 year and 8 months) than the E-M1 III, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. 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 Sony A7 IV implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7 IV for good quality output (200 dots per inch) amounts to 35 x 23.4 inches or 89 x 59.3 cm, for very good quality (250 dpi) 28 x 18.7 inches or 71.2 x 47.5 cm, and for excellent quality (300 dpi) 23.4 x 15.6 inches or 59.3 x 39.6 cm. The corresponding values for the Olympus E-M1 III are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.

Unlike the A7 IV, the E-M1 III has the capacity to capture high quality composite images (80MP) 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 Olympus OM-D E-M1 Mark III has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 64-25600. The corresponding ISO settings for the Sony Alpha A7 IV are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

In terms of underlying technology, the E-M1 III is build around a CMOS sensor, while the A7 IV uses a BSI-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.

E-M1 III versus A7 IV 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"). 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
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Olympus E-M1 III Four Thirds 20.2 5184 38884K/30p23.313.1135676
2.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
3.
 
Olympus E-M5 III Four Thirds 20.2 5184 38884K/30p23.313.1132476
4.
 
Olympus E-M1X Four Thirds 20.2 5184 38884K/30p23.213.0125475
5.
 
Olympus E-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
6.
 
Olympus E-M1 Four Thirds 15.9 4608 34561080/30p23.012.775773
7.
 
OM System OM-1 Four Thirds 20.2 5184 38884K/60p23.413.4155377
8.
 
Panasonic GH5 II Four Thirds 20.2 5184 38884K/60p23.713.1113679
9.
 
Panasonic G95 Four Thirds 20.2 5184 38884K/30p23.213.0127375
10.
 
Panasonic G9 Four Thirds 20.2 5184 38884K/60p23.112.8113874
11.
 
Panasonic GH5 Four Thirds 20.2 5184 38884K/60p23.913.080777
12.
 
Panasonic GX8 Four Thirds 20.2 5184 38884K/30p23.512.680675
13.
 
Sony A9 II Full Frame 24.0 6000 40004K/30p25.014.0343493
14.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
15.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
16.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
17.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.3299385
Note: DXO values in italics represent estimates based on sensor size and age.

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, but the A7 IV provides a faster frame rate than the E-M1 III. It can shoot movie footage at 4K/60p, while the Olympus is limited to 4K/30p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the A7 IV offers a substantially higher resolution than the one in the E-M1 III (3686k vs 2360k dots). The following table reports on some other key feature differences and similarities of the Olympus E-M1 III, the Sony A7 IV, and comparable cameras.

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Core Features
    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.
 
Olympus E-M1 III2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
2.
 
Sony A7 IV3686 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
3.
 
Olympus E-M5 III2360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
4.
 
Olympus E-M1X2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
5.
 
Olympus E-M1 II2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
6.
 
Olympus E-M12360 n3.0 / 1037 tilting Y 1/8000s 10.0/s n Y
7.
 
OM System OM-15760 n3.0 / 1640 swivel Y 1/8000s 10.0/s n Y
8.
 
Panasonic GH5 II3680 n3.0 / 1840 swivel Y 1/8000s 12.0/s n Y
9.
 
Panasonic G952360 n3.0 / 1240 swivel Y 1/4000s 9.0/s Y Y
10.
 
Panasonic G93680 Y3.0 / 1040 swivel Y 1/8000s 20.0/s n Y
11.
 
Panasonic GH53680 n3.2 / 1620 swivel Y 1/8000s 12.0/s n Y
12.
 
Panasonic GX82360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
13.
 
Sony A9 II3686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
14.
 
Sony A7R IV5760 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
15.
 
Sony A7 III2359 n3.0 / 922 tilting Y 1/8000s 10.0/s n Y
16.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
17.
 
Sony A7S II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.

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 Olympus E-M1 III 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 E-M1 III writes its imaging data to SDXC cards, while the A7 IV uses CFexpress (type A) or SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. However, while the A7 IV supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s) on both slots, the E-M1 III supports UHS-II only on its first slot and UHS-I (data transfer speed up to 104 MB/s) on the second one.

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 Olympus OM-D E-M1 Mark III and Sony Alpha A7 IV and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Olympus E-M1 IIIYstereo / monoYYmicro3.1Y-Y
2.
 
Sony A7 IVYstereo / monoYYfull3.2Y-Y
3.
 
Olympus E-M5 IIIYstereo / monoY-micro2.0Y-Y
4.
 
Olympus E-M1XYstereo / monoYYmicro3.0Y-Y
5.
 
Olympus E-M1 IIYstereo / monoYYmicro3.0Y--
6.
 
Olympus E-M1Ystereo / monoY-micro2.0Y--
7.
 
OM System OM-1Ystereo / monoYYmicro3.0Y-Y
8.
 
Panasonic GH5 IIYstereo / monoYYfull3.2Y-Y
9.
 
Panasonic G95Ystereo / monoYYmicro2.0Y-Y
10.
 
Panasonic G9Ystereo / monoYYfull3.0Y-Y
11.
 
Panasonic GH5Ystereo / monoYYfull3.1Y-Y
12.
 
Panasonic GX8Ystereo / monoY-micro2.0YY-
13.
 
Sony A9 IIYstereo / monoYYmicro3.1YYY
14.
 
Sony A7R IVYstereo / monoYYmicro3.1YYY
15.
 
Sony A7 IIIYstereo / monoYYmicro3.1YYY
16.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
17.
 
Sony A7S IIYstereo / monoYYmicro2.0YY-

Studio photographers will appreciate that the Olympus E-M1 III (unlike the A7 IV) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the E-M1 III and the A7 IV are recent models that are part of the current product line-up. The E-M1 III replaced the earlier Olympus E-M1 II, while the A7 IV followed on from the Sony A7 III. Further information on the features and operation of the E-M1 III and A7 IV can be found, respectively, in the Olympus E-M1 III Manual (free pdf) or the online Sony A7 IV Manual.

Review summary

So how do things add up? Is the Olympus E-M1 III better than the Sony A7 IV or vice versa? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Olympus OM-D E-M1 Mark III:

  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Faster burst: Shoots at higher frequency (18 vs 10 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Less heavy: Is lighter (by 79g or 12 percent) and hence easier to carry around.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More affordable: Was introduced into a lower priced category (28 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in February 2020).

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Reasons to prefer the Sony Alpha A7 IV:

  • More detail: Has more megapixels (32.7 vs 20.2MP), which boosts linear resolution by 30%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better video: Provides higher movie framerates (4K/60p versus 4K/30p).
  • More detailed viewfinder: Has higher resolution electronic viewfinder (3686k vs 2360k dots).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.74x).
  • Longer lasting: Gets more shots (580 versus 420) out of a single battery charge.
  • Faster data transfer: Supports a more advanced USB protocol (3.2 vs 3.1).
  • More solid recording: Has a full-sized HDMI port for a sturdy connection to an external recorder.
  • More modern: Was introduced somewhat (1 year and 8 months) more recently.

If the count of individual advantages (bullet points above) is taken as a guide, the A7 IV is the clear winner of the contest (12 : 7 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

E-M1 III 07:12 A7 IV

How about other alternatives? Do the specifications of the Olympus E-M1 III and the Sony A7 IV 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 comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it says little about, for example, the shooting experience and imaging performance of the E-M1 III and the A7 IV in practical situations. 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 why expert reviews are important. The following table reports the overall ratings of the cameras as published by some of the major 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
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Olympus E-M1 III5/5..5/583/1004.5/54/5 Feb 2020 1,799 amazon.com
2.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 2,499 amazon.com
3.
 
Olympus E-M5 III5/5+5/582/1004.5/54.5/5 Oct 2019 1,199 amazon.com
4.
 
Olympus E-M1X4.5/5o5/585/1004.5/5.. Jan 2019 2,999 amazon.com
5.
 
Olympus E-M1 II5/5+ +5/585/1004.5/54.5/5 Sep 2016 1,999ebay.com
6.
 
Olympus E-M15/5+ +..84/1004.5/54.5/5 Sep 2013 1,399ebay.com
7.
 
OM System OM-15/5....87/1005/54.5/5 Feb 2022 2,199 amazon.com
8.
 
Panasonic GH5 II4.5/5..4.5/585/1004.5/55/5 May 2021 1,699 amazon.com
9.
 
Panasonic G954.5/5+4.5/583/1004.5/54.5/5 Apr 2019 999 amazon.com
10.
 
Panasonic G9..+ +5/585/1005/55/5 Nov 2017 1,699 amazon.com
11.
 
Panasonic GH54.5/5+ +..85/1004.5/55/5 Jan 2017 1,999ebay.com
12.
 
Panasonic GX85/5+..82/1004.5/54.5/5 Jul 2015 1,199ebay.com
13.
 
Sony A9 II....5/590/1005/55/5 Oct 2019 4,499 amazon.com
14.
 
Sony A7R IV5/5+4.5/591/1004.5/55/5 Jul 2019 3,499 amazon.com
15.
 
Sony A7 III..+ +4.5/589/1005/55/5 Feb 2018 1,999 amazon.com
16.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199ebay.com
17.
 
Sony A7S II5/5+....4.5/55/5 Sep 2015 2,999ebay.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. 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? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Olympus E-M1 III vs Sony A7 IV

    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 Olympus E-M1 III Sony A7 IV
    Camera Type Mirrorless system camera Mirrorless system camera
    Camera Lens Micro Four Thirds lenses Sony E mount lenses
    Launch Date February 2020 October 2021
    Launch Price USD 1,799 USD 2,499
    Sensor Specs Olympus E-M1 III Sony A7 IV
    Sensor Technology CMOS BSI-CMOS
    Sensor Format Four Thirds Sensor Full Frame Sensor
    Sensor Size 17.3 x 13.0 mm 35.9 x 23.9 mm
    Sensor Area 224.9 mm2 858.01 mm2
    Sensor Diagonal 21.6 mm 43.1 mm
    Crop Factor 2.0x 1.0x
    Sensor Resolution 20.2 Megapixels 32.7 Megapixels
    Image Resolution 5184 x 3888 pixels 7008 x 4672 pixels
    Pixel Pitch 3.34 μm 5.12 μm
    Pixel Density 8.96 MP/cm2 3.82 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 4K/60p Video
    ISO Setting 200 - 25,600 ISO 100 - 51,200 ISO
    ISO Boost 64 - 25,600 ISO 50 - 204,800 ISO
    Image Processor TruePic IX BIONZ XR
    DXO Sensor Quality (score) .. 97
    DXO Color Depth (bits) .. 25.4
    DXO Dynamic Range (EV) .. 14.7
    DXO Low Light (ISO) .. 3379
    Screen Specs Olympus E-M1 III Sony A7 IV
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.74x 0.78x
    Viewfinder Resolution 2360k dots 3686k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1037k dots 1037k dots
    LCD Attachment Swivel screen Swivel screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Olympus E-M1 III Sony A7 IV
    Focus System On-Sensor Phase-detect On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 18 shutter flaps/s 10 shutter flaps/s
    Shutter Life Expectancy400 000 actuations200 000 actuations
    Electronic Shutterup to 1/32000sYES
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards CFexA or SDXC cards
    Single or Dual Card Slots Dual card slots Dual card slots
    UHS card support Single UHS-II Dual UHS-II
    Connectivity Specs Olympus E-M1 III Sony A7 IV
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 3.1 USB 3.2
    HDMI Port micro HDMI full HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support Bluetooth built-in Bluetooth built-in
    Body Specs Olympus E-M1 III Sony A7 IV
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type BLH-1 NP-FZ100
    Battery Life (CIPA)420 shots per charge580 shots per charge
    In-Camera Charging USB charging USB charging
    Body Dimensions 134 x 91 x 69 mm
    (5.3 x 3.6 x 2.7 in)
    131 x 96 x 80 mm
    (5.2 x 3.8 x 3.1 in)
    Camera Weight 580 g (20.5 oz) 659 g (23.2 oz)
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