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Olympus E-M10 III versus Panasonic GX85

The Olympus OM-D E-M10 Mark III and the Panasonic Lumix DMC-GX85 (labelled Panasonic GX80 in some countries) are two digital cameras that were revealed to the public, respectively, in August 2017 and April 2016. Both the E-M10 III and the GX85 are mirrorless interchangeable lens cameras that are equipped with a Four Thirds sensor. The Olympus has a resolution of 15.9 megapixel, whereas the Panasonic provides 15.8 MP.

Body comparison

An illustration of the physical size and weight of the Olympus E-M10 III and the Panasonic GX85 is provided in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left – the E-M10 III – represents the basis or 100 percent across all the size and weight measures).

Olympus E-M10 III vs Panasonic GX85 front
E-M10 III versus GX85 top view
E-M10 III and GX85 rear side
Body view (E-M10 III on the left)

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Panasonic GX85 is notably smaller (15 percent) than the Olympus E-M10 III. However, the GX85 is slightly heavier (4 percent) than the E-M10 III. In this context, it is worth noting that neither the E-M10 III nor the GX85 are weather-sealed.

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. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can find an overview of suitable optics in the Micro Four Thirds Lens Catalog. 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.

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, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible comparisons there.

Camera Body Specifications
Camera Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(y/n)
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Olympus E-M10 III (⇒ rgt) 122 mm 84 mm 50 mm 410 g 330 no 2017 649 latest check
Panasonic GX85 (⇒ lft) 122 mm 71 mm 44 mm 426 g 290 no 2016 799 latest check
Fujifilm X-E2S (⇒ lft | rgt) 129 mm 75 mm 37 mm 350 g 350 no 2016 699discont. check
Olympus PEN-F (⇒ lft | rgt) 125 mm 72 mm 37 mm 427 g 330 no 2016 1,199 latest check
Olympus E-M10 II (⇒ lft | rgt) 120 mm 83 mm 47 mm 390 g 320 no 2015 799discont. check
Olympus E-M5 II (⇒ lft | rgt) 124 mm 85 mm 45 mm 469 g 310 YES 2015 1,099 latest check
Olympus E-M10 (⇒ lft | rgt) 119 mm 82 mm 46 mm 396 g 320 no 2014 699discont. check
Olympus E-P5 (⇒ lft | rgt) 122 mm 69 mm 37 mm 420 g 330 no 2013 999discont. check
Olympus E-620 (⇒ lft | rgt) 130 mm 94 mm 60 mm 521 g 500 no 2009 699discont. check
Panasonic GX850 (⇒ lft | rgt) 107 mm 65 mm 33 mm 269 g 210 no 2017 549 latest check
Panasonic G85 (⇒ lft | rgt) 128 mm 89 mm 74 mm 505 g 330 YES 2016 899 latest check
Panasonic ZS100 (⇒ lft | rgt) 111 mm 65 mm 44 mm 312 g 300 no 2016 699 latest check
Panasonic GM1 (⇒ lft | rgt) 99 mm 55 mm 30 mm 204 g 230 no 2013 749discont. check

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-M10 III was launched at a somewhat lower price (by 19 percent) than the GX85, which makes it more attractive for photographers on a tight budget. 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 imaging sensor is a crucial determinant 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. 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 are more costly to manufacture and tent to lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature a Four Thirds sensor and have a format factor (sometimes also referred to as "crop factor") of 2.0. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Olympus E-M10 III and Panasonic GX85 sensor measures
Sensor size
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Sensor size

While the two cameras under review share the same sensor size, the E-M10 III offers a higher resolution of 15.9 megapixel, compared with 15.8 MP of the GX85. This megapixel advantage translates into a 0 percent gain in linear resolution. On the other hand, these sensor specs imply that the E-M10 III has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 3.77μm for the GX85). In this context, it should be noted, however, that the E-M10 III is a somewhat more recent model (by 1 year and 4 months) than the GX85, and its sensor might have benefitted from technological advances during this time that at least partly compensate for the smaller pixel size. 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.

E-M10 III versus GX85 MP
Sensor resolution
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Sensor resolution

Consistent information on actual sensor performance is available from DXO Mark for most cameras. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Olympus E-M10 III (⇒ rgt) Four Thirds 15.9 4608 3456 4K/30p .. .. .. ..
Panasonic GX85 (⇒ lft) Four Thirds 15.8 4592 3448 4K/30p 22.9 12.6 662 71
Fujifilm X-E2S (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/60p - - - -
Olympus PEN-F (⇒ lft | rgt) Four Thirds 20.2 5184 3888 1080/60p 23.1 12.4 894 74
Olympus E-M10 II (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/60p 23.1 12.5 842 73
Olympus E-M5 II (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/60p 23.0 12.5 842 73
Olympus E-M10 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/30p 22.8 12.3 884 72
Olympus E-P5 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/30p 22.8 12.4 895 72
Olympus E-620 (⇒ lft | rgt) Four Thirds 12.2 4032 3024 no 21.3 10.3 536 55
Panasonic GX850 (⇒ lft | rgt) Four Thirds 15.8 4592 3448 4K/30p .. .. .. ..
Panasonic G85 (⇒ lft | rgt) Four Thirds 15.8 4592 3448 4K/30p 22.8 12.5 656 71
Panasonic ZS100 (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.8 12.5 559 70
Panasonic GM1 (⇒ lft | rgt) Four Thirds 15.8 4592 3448 1080/60i 22.3 11.7 660 66

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, and both provide the same movie specifications (4K/30p).

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the GX85 offers a higher resolution than the one in the E-M10 III (2765k vs 2360k dots). The following table reports on some other key feature differences and similarities of the Olympus E-M10 III, the Panasonic GX85, and comparable cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.

Core Features
Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(Y/n)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(Y/n)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(GN)
Build-in
Image
Stab
Olympus E-M10 III (⇒ rgt) 2360 no 3.0 1040 tilting YES 4000 8.6 5.8 YES
Panasonic GX85 (⇒ lft) 2765 no 3.0 1040 tilting YES 4000 8.0 6 YES
Fujifilm X-E2S (⇒ lft | rgt) 2360 no 3.0 1040 fixed no 4000 7.0 7 no
Olympus PEN-F (⇒ lft | rgt) 2360 no 3.0 1037 swivel YES 8000 10.0 no YES
Olympus E-M10 II (⇒ lft | rgt) 2360 no 3.0 1040 tilting YES 4000 8.0 5.8 YES
Olympus E-M5 II (⇒ lft | rgt) 2360 no 3.0 1037 swivel YES 8000 10.0 no YES
Olympus E-M10 (⇒ lft | rgt) 1440 no 3.0 1037 tilting YES 4000 8.0 5.8 YES
Olympus E-P5 (⇒ lft | rgt) no no 3.0 1037 tilting YES 8000 9.0 7 YES
Olympus E-620 (⇒ lft | rgt) optical no 2.7 230 swivel no 4000 4.0 12 YES
Panasonic GX850 (⇒ lft | rgt) no no 3.0 1040 tilting YES 500 10.0 4 no
Panasonic G85 (⇒ lft | rgt) 2360 no 3.0 1040 swivel YES 4000 9.0 6.2 YES
Panasonic ZS100 (⇒ lft | rgt) 1166 no 3.0 1040 fixed YES 2000 10.0 YES YES
Panasonic GM1 (⇒ lft | rgt) no no 3.0 1036 fixed YES 500 5.0 4 no

Both the E-M10 III and the GX85 are current models that good online retailers will have in stock. You can check the latest prices, for example, at amazon. The GX85 replaced the earlier Panasonic GX7, while the E-M10 III followed on from the Olympus E-M10 II.

Summary

So how do things add up? Is there a clear favorite between the Olympus E-M10 III and the Olympus E-M10 III? Below is a summary of the relative strengths of each of the two contestants.


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Reasons to prefer the Olympus OM-D E-M10 Mark III:

  • Longer lasting: Can take more shots (330 versus 290) on a single battery charge.
  • More affordable: Was introduced into a lower priced segment (19 percent cheaper at launch).
  • More modern: Is somewhat more recent (announced 1 year and 4 months after the GX85).

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Advantages of the Panasonic Lumix DMC-GX85:

  • More detailed viewfinder: Has a higher resolution electronic viewfinder (2765k vs 2360k dots).
  • More compact: Is smaller (122x71mm vs 122x84mm) and will fit more readily into a bag.
  • More heavily discounted: Has been on the market for longer (launched in August 2017).

If the number of relative strengths (bullet points above) is taken as a guide, the match-up finishes in a tie (3 points each). 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.

E-M10 III 03:03 GX85

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the E-M10 III or the GX85 handle or perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased. This is where reviews by experts come in. The following table reports the overall rankings of the cameras as published by some of the major camera review sites. The detailed reviews can be accessed, respectively, on the websites of cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.

Review scores
Camera camera
labs
dp
review
ephoto
zine
imaging
resource
photography
blog
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Olympus E-M10 III (⇒ rgt) Rec 80/100 4.5/5 .. 4.5/5 2017 649 latest check
Panasonic GX85 (⇒ lft) HiRec 82/100 Silver 5/5 4.5/5 5/5 2016 799 latest check
Fujifilm X-E2S (⇒ lft | rgt) - 77/100 4.5/5 - 4.5/5 2016 699discont. check
Olympus PEN-F (⇒ lft | rgt) - 82/100 Silver 4.5/5 4.5/5 5/5 2016 1,199 latest check
Olympus E-M10 II (⇒ lft | rgt) HiRec 80/100 Silver 5/5 5/5 5/5 2015 799discont. check
Olympus E-M5 II (⇒ lft | rgt) HiRec 81/100 Silver 5/5 4.5/5 5/5 2015 1,099 latest check
Olympus E-M10 (⇒ lft | rgt) - 80/100 Gold 5/5 4.5/5 5/5 2014 699discont. check
Olympus E-P5 (⇒ lft | rgt) HiRec 78/100 Silver 4.5/5 4.5/5 5/5 2013 999discont. check
Olympus E-620 (⇒ lft | rgt) 88/100 72/100 HiRec 4.5/5 reviewed 5/5 2009 699discont. check
Panasonic GX850 (⇒ lft | rgt) Rec 76/100 4.5/5 - 4.5/5 2017 549 latest check
Panasonic G85 (⇒ lft | rgt) HiRec 84/100 Gold 5/5 4.5/5 4.5/5 2016 899 latest check
Panasonic ZS100 (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 4/5 4.5/5 2016 699 latest check
Panasonic GM1 (⇒ lft | rgt) Rec 78/100 Gold 5/5 4.5/5 4.5/5 2013 749discont. check

Care should be taken when interpreting the review scores above, 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 comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Other comparisons

In case you would like to check on the differences and similarities of other camera models, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting. If the camera you are interested in is not available, please contact me, and I will try to locate and add the respective data to the application.

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