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Sony RX100 III versus Panasonic GX800

The Sony Cyber-shot DSC-RX100 III and the Panasonic Lumix DMC-GX800 (labelled Panasonic GX850 in some countries) are two digital cameras that were revealed to the public, respectively, in May 2014 and January 2017. The RX100 III is a fixed lens compact, while the GX800 is a mirrorless interchangeable lens camera. The cameras are based on an one-inch (RX100 III) and a Four Thirds sensor. The Sony has a resolution of 20 megapixel, whereas the Panasonic provides 15.8 MP.

Body comparison

An illustration of the physical size and weight of the Sony RX100 III and the Panasonic GX800 is provided in the side-by-side display below. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter. You can also use the toggle button to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left side – the RX100 III – represents the basis for the calculations across all the size and weight measures).

Sony RX100 III vs Panasonic GX800 front
RX100 III versus GX800 top view
RX100 III and GX800 rear side
Body view (RX100 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 GX800 is notably larger (18 percent) than the Sony RX100 III. In this context, it is worth noting that neither the RX100 III nor the GX800 are weather-sealed.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX100 III has a lens build in, whereas the GX800 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can find an overview of optics for the GX800 and their specifications in the Micro Four Thirds Lens Catalog.

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)
Sony RX100 III (⇒ rgt) 102 mm 58 mm 41 mm 290 g 320 no 2014 799discont. check
Panasonic GX800 (⇒ lft) 107 mm 65 mm 33 mm 269 g 210 no 2017 549 latest check
Canon G5 X (⇒ lft | rgt) 112 mm 76 mm 44 mm 353 g 210 no 2015 799 latest check
Canon G7 X (⇒ lft | rgt) 103 mm 60 mm 40 mm 304 g 210 no 2014 699discont. check
Olympus E-M10 III (⇒ lft | rgt) 122 mm 84 mm 50 mm 410 g 330 no 2017 649 latest check
Panasonic G7 (⇒ lft | rgt) 125 mm 86 mm 77 mm 410 g 350 no 2015 649discont. check
Panasonic FZ1000 (⇒ lft | rgt) 137 mm 99 mm 131 mm 831 g 360 no 2014 899discont. check
Panasonic G6 (⇒ lft | rgt) 122 mm 85 mm 71 mm 390 g 340 no 2013 599discont. check
Panasonic G5 (⇒ lft | rgt) 120 mm 83 mm 71 mm 396 g 320 no 2012 599discont. check
Panasonic G3 (⇒ lft | rgt) 115 mm 84 mm 47 mm 336 g .. no 2011 599discont. check
Ricoh GR II (⇒ lft | rgt) 117 mm 63 mm 35 mm 251 g 320 no 2015 699discont. check
Ricoh GR (⇒ lft | rgt) 117 mm 61 mm 35 mm 245 g 290 no 2013 799discont. check
Sony RX100 V (⇒ lft | rgt) 102 mm 58 mm 41 mm 299 g 220 no 2016 999 latest check
Sony RX100 IV (⇒ lft | rgt) 102 mm 58 mm 41 mm 298 g 280 no 2015 999discont. check
Sony A5100 (⇒ lft | rgt) 110 mm 63 mm 36 mm 283 g 400 no 2014 549 latest check
Sony RX100 II (⇒ lft | rgt) 102 mm 58 mm 38 mm 281 g 350 no 2013 749discont. check
Sony RX100 (⇒ lft | rgt) 102 mm 58 mm 36 mm 240 g 330 no 2012 649discont. check

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. 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. 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 associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Sony RX100 III features an one-inch sensor and the Panasonic GX800 a Four Thirds sensor. The sensor area in the GX800 is 94 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.7 and 2.0. The sensor in the RX100 III has a native 3:2 aspect ratio, while the one in the GX800 offers a 4:3 aspect.

Sony RX100 III and Panasonic GX800 sensor measures
Sensor size

Despite having a smaller sensor, the Sony RX100 III offers a higher resolution of 20 megapixel, compared with 15.8 MP of the Panasonic GX800. This megapixel advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 2.41μm versus 3.77μm for the GX800). Moreover, it should be noted that the GX800 is much more recent (by 2 years and 7 months) than the RX100 III, and its sensor will 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 the GX800 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

RX100 III versus GX800 MP
Sensor resolution

For most 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.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Sony RX100 III (⇒ rgt) 1-inch 20.0 5472 3648 1080/60p 22.4 12.3 495 67
Panasonic GX800 (⇒ lft) Four Thirds 15.8 4592 3448 4K/30p .. .. .. ..
Canon G5 X (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p - - - -
Canon G7 X (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p 23.0 12.7 556 71
Olympus E-M10 III (⇒ lft | rgt) Four Thirds 15.9 4608 3456 4K/30p .. .. .. ..
Panasonic G7 (⇒ lft | rgt) Four Thirds 15.8 4592 3448 4K/30p - - - -
Panasonic FZ1000 (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.1 11.7 517 64
Panasonic G6 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/60p 21.3 11.5 639 61
Panasonic G5 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/60p - - - -
Panasonic G3 (⇒ lft | rgt) Four Thirds 15.8 4592 3448 1080/60i 21 10.6 667 56
Ricoh GR II (⇒ lft | rgt) APS-C 16.1 4928 3264 1080/30p 23.6 13.7 1078 80
Ricoh GR (⇒ lft | rgt) APS-C 16.1 4928 3264 1080/30p 23.6 13.5 972 78
Sony RX100 V (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.8 12.4 586 70
Sony RX100 IV (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.8 12.6 591 70
Sony A5100 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.8 12.7 1347 80
Sony RX100 II (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p 22.5 12.4 483 67
Sony RX100 (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p 22.6 12.4 390 66

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the GX800 provides a better video resolution than the RX100 III. It can shoot movie footage at 4K/30p, while the Sony is limited to 1080/60p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the RX100 III has an electronic viewfinder (1440k dots), which can be very helpful when shooting in bright sunlight. In contrast, the GX800 relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Sony RX100 III and Panasonic GX800 along with similar information for a selection of comparators. If needed, the dpreview camera hub, for example, contains further detail on the cameras' specs.

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
Sony RX100 III (⇒ rgt) 1440 no 3.0 1229 tilting no 2000 10.0 YES YES
Panasonic GX800 (⇒ lft) no no 3.0 1040 tilting YES 500 10.0 4 no
Canon G5 X (⇒ lft | rgt) 2360 no 3.0 1040 swivel YES 2000 5.9 7 YES
Canon G7 X (⇒ lft | rgt) no no 3.0 1040 tilting YES 2000 6.5 7 YES
Olympus E-M10 III (⇒ lft | rgt) 2360 no 3.0 1040 tilting YES 4000 8.6 5.8 YES
Panasonic G7 (⇒ lft | rgt) 2360 no 3.0 1040 swivel YES 4000 7.0 9.3 no
Panasonic FZ1000 (⇒ lft | rgt) 2359 no 3.0 921 swivel no 4000 12.0 13.5 YES
Panasonic G6 (⇒ lft | rgt) 1440 no 3.0 1036 swivel YES 4000 7.0 10.5 no
Panasonic G5 (⇒ lft | rgt) 1440 no 3.0 920 swivel YES 4000 6.0 10.5 no
Panasonic G3 (⇒ lft | rgt) 1440 no 3.0 460 swivel YES 4000 4.0 11 no
Ricoh GR II (⇒ lft | rgt) no no 3.0 1230 fixed no 4000 4.0 3 no
Ricoh GR (⇒ lft | rgt) no no 3.0 1230 fixed no 4000 4.0 5.4 no
Sony RX100 V (⇒ lft | rgt) 2359 no 3.0 1229 tilting no 2000 24.0 10.2 YES
Sony RX100 IV (⇒ lft | rgt) 2359 no 3.0 1228 tilting no 2000 16.0 10.2 YES
Sony A5100 (⇒ lft | rgt) no no 3.0 922 tilting YES 4000 6.0 4 no
Sony RX100 II (⇒ lft | rgt) no no 3.0 1229 tilting no 2000 10.0 15 YES
Sony RX100 (⇒ lft | rgt) no no 3.0 1229 fixed no 2000 10.0 YES YES

The GX800 is a current model that online retailers, such as amazon, will have in stock. In contrast, the RX100 III has been discontinued (but it can be found pre-owned on ebay). As a replacement in the same line of cameras, the RX100 III was succeeded by the Sony RX100 IV.

Summary

So what is the bottom line? Is the Sony RX100 III better than the Panasonic GX800 or vice versa? 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 Cyber-shot DSC-RX100 III:

  • More detail: Offers more megapixels (20 vs 15.8MP) with a 15% higher linear resolution.
  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Easier framing: Has an electronic viewfinder for image framing and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 1040k dots).
  • Faster shutter: Has higher mechanical shutter speed (2000/sec vs 500/sec) to freeze action.
  • Ready to shoot: Has a lens build-in, whereas the GX800 requires a separate lens.
  • More compact: Is smaller (102x58mm vs 107x65mm) and thus needs less room in the bag.
  • Longer lasting: Can take more shots (320 versus 210) on a single battery charge.
  • More heavily discounted: Has been available for much longer (launched in May 2014).

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Advantages of the Panasonic Lumix DMC-GX800:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • More flexible: Takes interchangeable lenses and can thus be used with specialty optics.
  • More modern: Reflects 2 years and 7 months of technical progress since the RX100 III launch.

If the count of relative strengths (bullet points above) is taken as a measure, the RX100 III emerges as the winner of the contest (9 : 6 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.

RX100 III 09:06 GX800

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the RX100 III or the GX800 handle or perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable. This is why hands-on reviews by experts are important. The adjacent table relays the overall verdicts of several of the most popular camera review sites. You can find the full text of the reviews, respectively, at 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)
Sony RX100 III (⇒ rgt) HiRec 82/100 Gold 4.5/5 4.5/5 5/5 2014 799discont. check
Panasonic GX800 (⇒ lft) Rec 76/100 4.5/5 - 4.5/5 2017 549 latest check
Canon G5 X (⇒ lft | rgt) HiRec 78/100 Silver 4.5/5 4/5 4.5/5 2015 799 latest check
Canon G7 X (⇒ lft | rgt) HiRec 77/100 Silver 4.5/5 3.5/5 4.5/5 2014 699discont. check
Olympus E-M10 III (⇒ lft | rgt) Rec 80/100 4.5/5 .. 4.5/5 2017 649 latest check
Panasonic G7 (⇒ lft | rgt) HiRec 80/100 Silver 5/5 4.5/5 4.5/5 2015 649discont. check
Panasonic FZ1000 (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 4.5/5 4.5/5 2014 899discont. check
Panasonic G6 (⇒ lft | rgt) HiRec - 5/5 - 4.5/5 2013 599discont. check
Panasonic G5 (⇒ lft | rgt) HiRec - 4.5/5 4.5/5 4.5/5 2012 599discont. check
Panasonic G3 (⇒ lft | rgt) 88/100 HiRec 75/100 Silver 4.5/5 4.5/5 5/5 2011 599discont. check
Ricoh GR II (⇒ lft | rgt) - - 4.5/5 4.5/5 4.5/5 2015 699discont. check
Ricoh GR (⇒ lft | rgt) - 79/100 Gold 4.5/5 4.5/5 4.5/5 2013 799discont. check
Sony RX100 V (⇒ lft | rgt) HiRec 83/100 Silver 4/5 5/5 4.5/5 2016 999 latest check
Sony RX100 IV (⇒ lft | rgt) HiRec 85/100 Gold 4/5 4.5/5 4.5/5 2015 999discont. check
Sony A5100 (⇒ lft | rgt) Rec - 4.5/5 4.5/5 5/5 2014 549 latest check
Sony RX100 II (⇒ lft | rgt) HiRec 79/100 Silver 4.5/5 5/5 4.5/5 2013 749discont. check
Sony RX100 (⇒ lft | rgt) HiRec 78/100 Silver 4/5 5/5 5/5 2012 649discont. 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. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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 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. If the camera you are interested in is not available, kindly get in touch, and I will try to add information on that model to the database.

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