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Fujifilm X-A3 versus Sony RX100 III

The Fujifilm X-A3 and the Sony Cyber-shot DSC-RX100 III are two digital cameras that were announced, respectively, in August 2016 and May 2014. The X-A3 is a mirrorless interchangeable lens camera, while the RX100 III is a fixed lens compact. The cameras are based on an APS-C (X-A3) and an one-inch (RX100 III) sensor. The Fujifilm has a resolution of 24 megapixel, whereas the Sony provides 20 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.

Body comparison: Fujifilm X-A3 vs Sony RX100 III

An illustration of the physical size and weight of the Fujifilm X-A3 and the Sony RX100 III is provided in the side-by-side display below. Three consecutive perspectives from the front, the top, and the back are presented. 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 side – the X-A3 – represents the basis for the calculations across all the size and weight measures).

Compare Fujifilm X-A3 vs Sony RX100 III
X-A3 versus RX100 III top view
X-A3 and RX100 III rear side

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony RX100 III is notably smaller (25 percent) than the Fujifilm X-A3. In this context, it is worth noting that neither the X-A3 nor the RX100 III 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 X-A3 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 X-A3 and their specifications in the Fujinon X Lens Catalog.

Concerning battery life, the X-A3 gets 410 shots out of its NP-W126S battery, while the RX100 III can take 320 images on a single charge of its NP-BX1 power pack.

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 camera 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)
Fujifilm X-A3 (⇒ rgt) 4.6 in 2.6 in 1.6 in 12.0 oz 410 no 2016 399 latest check
Sony RX100 III (⇒ lft) 4.0 in 2.3 in 1.6 in 10.2 oz 320 no 2014 799discont. check
Canon SX730 (⇒ lft | rgt) 4.3 in 2.5 in 1.6 in 10.6 oz 250 no 2017 399 latest check
Canon G5 X (⇒ lft | rgt) 4.4 in 3.0 in 1.7 in 12.5 oz 210 no 2015 799 latest check
Canon G7 X (⇒ lft | rgt) 4.1 in 2.4 in 1.6 in 10.7 oz 210 no 2014 699discont. check
Fujifilm X-A5 (⇒ lft | rgt) 4.6 in 2.7 in 1.6 in 12.7 oz 450 no 2018 399 latest check
Fujifilm X-E3 (⇒ lft | rgt) 4.8 in 2.9 in 1.7 in 11.9 oz 350 no 2017 899 latest check
Fujifilm X-T20 (⇒ lft | rgt) 4.6 in 3.3 in 1.6 in 13.5 oz 350 no 2017 899 latest check
Fujifilm X-E2S (⇒ lft | rgt) 5.1 in 3.0 in 1.5 in 12.3 oz 350 no 2016 699discont. check
Fujifilm X-A10 (⇒ lft | rgt) 4.6 in 2.6 in 1.6 in 11.7 oz 410 no 2016 399 latest check
Fujifilm X-T10 (⇒ lft | rgt) 4.6 in 3.3 in 1.6 in 13.4 oz 350 no 2015 799discont. check
Fujifilm X-A2 (⇒ lft | rgt) 4.6 in 2.6 in 1.6 in 12.3 oz 410 no 2015 399discont. check
Fujifilm X-A1 (⇒ lft | rgt) 4.6 in 2.6 in 1.5 in 11.6 oz 350 no 2013 399discont. check
Panasonic FZ1000 (⇒ lft | rgt) 5.4 in 3.9 in 5.2 in 29.3 oz 360 no 2014 899discont. check
Sony RX100 IV (⇒ lft | rgt) 4.0 in 2.3 in 1.6 in 10.5 oz 280 no 2015 999discont. check
Sony RX100 II (⇒ lft | rgt) 4.0 in 2.3 in 1.5 in 9.9 oz 350 no 2013 749discont. check
YI M1 (⇒ lft | rgt) 4.5 in 2.5 in 1.3 in 9.9 oz 450 no 2016 349 latest check

The price is, of course, an important factor in any camera decision. The listed launch 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: Fujifilm X-A3 vs Sony RX100 III

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 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Fujifilm X-A3 features an APS-C sensor and the Sony RX100 III an one-inch sensor. The sensor area in the RX100 III is 69 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 2.7. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Fujifilm X-A3 and Sony RX100 III sensor measures

With 24MP, the X-A3 offers a higher resolution than the RX100 III (20MP), but the X-A3 nevertheless has larger individual pixels (pixel pitch of 3.92μm versus 2.41μm for the RX100 III) due to its larger sensor. Moreover, the X-A3 is a somewhat more recent model (by 2 years and 3 months) than the RX100 III, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels.

X-A3 versus RX100 III MP

For most cameras, data on sensor performance has been reported by DXO Mark. 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Fujifilm X-A3 (⇒ rgt) APS-C 24.0 6000 4000 1080/60p - - - -
Sony RX100 III (⇒ lft) 1-inch 20.0 5472 3648 1080/60p 22.4 12.3 495 67
Canon SX730 (⇒ lft | rgt) 1/2.3 20.2 5184 3888 1080/60p - - - -
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
Fujifilm X-A5 (⇒ lft | rgt) APS-C 24.0 6000 4000 4K/15p .. .. .. ..
Fujifilm X-E3 (⇒ lft | rgt) APS-C 24.0 6000 4000 4K/30p - - - -
Fujifilm X-T20 (⇒ lft | rgt) APS-C 24.0 6000 4000 4K/30p - - - -
Fujifilm X-E2S (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/60p - - - -
Fujifilm X-A10 (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/30p - - - -
Fujifilm X-T10 (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/60p - - - -
Fujifilm X-A2 (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/30p - - - -
Fujifilm X-A1 (⇒ lft | rgt) APS-C 16.0 4896 3264 1080/30p - - - -
Panasonic FZ1000 (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.1 11.7 517 64
Sony RX100 IV (⇒ lft | rgt) 1-inch 20.0 5472 3648 4K/30p 22.8 12.6 591 70
Sony RX100 II (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p 22.5 12.4 483 67
YI M1 (⇒ lft | rgt) Four Thirds 20.2 5184 3888 4K/30p - - - -

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, and both provide the same movie specifications (1080/60p).

Feature comparison: Fujifilm X-A3 vs Sony RX100 III

Apart from 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 X-A3 relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Fujifilm X-A3 and Sony RX100 III along with similar information for a selection of comparators. 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
Fujifilm X-A3 (⇒ rgt) no no 3.0 1040 tilting YES 4000 6.0 7 no
Sony RX100 III (⇒ lft) 1440 no 3.0 1229 tilting no 2000 10.0 YES YES
Canon SX730 (⇒ lft | rgt) no no 3.0 922 tilting no 3200 5.9 4 YES
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
Fujifilm X-A5 (⇒ lft | rgt) no no 3.0 1040 tilting YES 4000 6.0 5.7 no
Fujifilm X-E3 (⇒ lft | rgt) 2360 no 3.0 1040 fixed YES 4000 8.0 no no
Fujifilm X-T20 (⇒ lft | rgt) 2360 no 3.0 1040 tilting YES 4000 8.0 5 no
Fujifilm X-E2S (⇒ lft | rgt) 2360 no 3.0 1040 fixed no 4000 7.0 7 no
Fujifilm X-A10 (⇒ lft | rgt) no no 3.0 1040 tilting no 4000 6.0 5 no
Fujifilm X-T10 (⇒ lft | rgt) 2360 no 3.0 920 tilting no 4000 8.0 5 no
Fujifilm X-A2 (⇒ lft | rgt) no no 3.0 920 tilting no 4000 5.6 7 no
Fujifilm X-A1 (⇒ lft | rgt) no no 3.0 920 tilting no 4000 5.6 7 no
Panasonic FZ1000 (⇒ lft | rgt) 2359 no 3.0 921 swivel no 4000 12.0 13.5 YES
Sony RX100 IV (⇒ lft | rgt) 2359 no 3.0 1228 tilting no 2000 16.0 10.2 YES
Sony RX100 II (⇒ lft | rgt) no no 3.0 1229 tilting no 2000 10.0 15 YES
YI M1 (⇒ lft | rgt) no no 3.0 1040 fixed YES 4000 5.0 no no

The X-A3 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.

Review summary: Fujifilm X-A3 vs Sony RX100 III

So how do things add up? Is there a clear favorite between the Fujifilm X-A3 and the Sony RX100 III? A synthesis of the relative strong points of each of the models is listed below.


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Advantages of the Fujifilm X-A3:

  • More detail: Offers more megapixels (24 vs 20MP) with a 10% higher linear resolution.
  • Better image quality: Features a larger and more technologically advanced imaging sensor.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster shutter: Has higher mechanical shutter speed (4000/sec vs 2000/sec) to freeze action.
  • More flexible: Accepts interchangeable lenses, so that lens characteristics can be altered.
  • Longer lasting: Can take more shots (410 versus 320) on a single battery charge.
  • More modern: Reflects 2 years and 3 months of technical progress since the RX100 III launch.

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Arguments in favor of the Sony Cyber-shot DSC-RX100 III:

  • 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 burst: Shoots at higher frequency (10 vs 6 flaps/sec) to capture the decisive moment.
  • Ready to shoot: Has an integrated lens, whereas the X-A3 necessitates an extra lens.
  • More compact: Is smaller (102x58mm vs 117x67mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight even though it has a lens build in (unlike the X-A3).
  • Sharper images: Has stabilization technology build-in to reduce the impact of hand-shake.
  • More heavily discounted: Has been around for much longer (launched in May 2014).

If the count of relative strengths (bullet points above) is taken as a measure, the RX100 III comes out slightly ahead of the X-A3 (8 : 7 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision.

X-A3 07:08 RX100 III

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the X-A3 or the RX100 III. 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 table below summarizes the assessments of some of the best known camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). You can find the full text of the reviews by clicking on the site logo in the table header.

Review scores
Camera cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Fujifilm X-A3 (⇒ rgt) - 74/100 4.5/5 - 4/5 2016 399 latest check
Sony RX100 III (⇒ lft) HiRec 82/100 Gold 4.5/5 4.5/5 5/5 2014 799discont. check
Canon SX730 (⇒ lft | rgt) Rec - 4/5 - 4/5 2017 399 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
Fujifilm X-A5 (⇒ lft | rgt) .. .. .. .. 3.5/5 2018 399 latest check
Fujifilm X-E3 (⇒ lft | rgt) Rec 84/100 Gold 4.5/5 4.5/5 4.5/5 2017 899 latest check
Fujifilm X-T20 (⇒ lft | rgt) HiRec 82/100 Silver 5/5 .. 4.5/5 2017 899 latest check
Fujifilm X-E2S (⇒ lft | rgt) - 77/100 4.5/5 - 4.5/5 2016 699discont. check
Fujifilm X-A10 (⇒ lft | rgt) - - 4/5 - 4/5 2016 399 latest check
Fujifilm X-T10 (⇒ lft | rgt) HiRec 80/100 Silver 5/5 4/5 5/5 2015 799discont. check
Fujifilm X-A2 (⇒ lft | rgt) - - 4.5/5 4/5 4.5/5 2015 399discont. check
Fujifilm X-A1 (⇒ lft | rgt) - - 4.5/5 - 4.5/5 2013 399discont. check
Panasonic FZ1000 (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 4.5/5 4.5/5 2014 899discont. check
Sony RX100 IV (⇒ lft | rgt) HiRec 85/100 Gold 4/5 4.5/5 4.5/5 2015 999discont. check
Sony RX100 II (⇒ lft | rgt) HiRec 79/100 Silver 4.5/5 5/5 4.5/5 2013 749discont. check
YI M1 (⇒ lft | rgt) - 69/100 - 2.5/5 - 2016 349 latest check

Care should be taken when interpreting the review scores above, though. The ratings are only valid when refering to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored. If the camera you are interested in is not available, please contact me, and I will try to add information on that model to the database.

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