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Pentax K-3 II versus Canon G1 X Mark III

The Pentax K-3 II and the Canon PowerShot G1 X Mark III are two enthusiast cameras that were announced, respectively, in April 2015 and October 2017. The K-3 II is a DSLR, while the G1X Mark III is a fixed lens compact. Both cameras are equipped with an APS-C sensor. The Pentax has a resolution of 24.1 megapixel, whereas the Canon provides 24 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: Pentax K-3 II vs Canon G1 X Mark III

The side-by-side display below illustrates the physical size and weight of the Pentax K-3 II and the Canon G1 X Mark III. Three successive views from the front, the top, and the rear 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 K-3 II – represents 100 percent across all the size and weight measures).

Snapsort Pentax K-3 II vs Canon G1 X Mark III
Compare K-3 II versus G1X Mark III top
Compare K-3 II and G1X Mark III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon G1 X Mark III is considerably smaller (32 percent) than the Pentax K-3 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 and possibly misleading, as the G1X Mark III has a lens build in, whereas the K-3 II is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.

Concerning battery life, the K-3 II gets 720 shots out of its D-LI90 battery, while the G1X Mark III can take 200 images on a single charge of its NB-13L 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
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Pentax K-3 II» 5.2 in 3.9 in 3.0 in 28.2 oz 720 Y Apr 2015 1,099 i i
Canon G1 X Mark III« 4.5 in 3.1 in 2.0 in 14.1 oz 200 Y Oct 2017 1,299 i i
Canon 6D Mark II« » 5.7 in 4.4 in 3.0 in 27.0 oz 1200 Y Jun 2017 1,999 i i
Canon 80D« » 5.5 in 4.1 in 3.1 in 25.8 oz 960 Y Feb 2016 1,199 i i
Canon 1D X Mark II« » 6.2 in 6.6 in 3.3 in 54.0 oz 1210 Y Feb 2016 5,999 i i
Nikon D7500« » 5.4 in 4.1 in 2.9 in 25.4 oz 950 Y Apr 2017 1,299 i i
Nikon D7200« » 5.4 in 4.2 in 3.0 in 27.0 oz 1110 Y Mar 2015 1,199- i
Olympus E-M1 II« » 5.3 in 3.6 in 2.6 in 20.2 oz 440 Y Sep 2016 1,999 i i
Olympus E-M5 II« » 4.9 in 3.3 in 1.8 in 16.5 oz 310 Y Feb 2015 1,099 i i
Panasonic GX8« » 5.2 in 3.1 in 2.5 in 17.2 oz 330 Y Jul 2015 1,199- i
Pentax KP« » 5.2 in 4.0 in 3.0 in 24.8 oz 390 Y Jan 2017 1,099 i i
Pentax K-70« » 5.0 in 3.7 in 2.9 in 24.3 oz 410 Y Jun 2016 649 i i
Pentax K-3« » 5.2 in 3.9 in 3.0 in 28.2 oz 560 Y Oct 2013 1,299- i
Pentax K-5« » 5.2 in 3.8 in 2.9 in 26.8 oz 740 Y Sep 2010 1,099- i
Sony RX10 III« » 5.2 in 3.7 in 5.0 in 37.1 oz 420 Y Mar 2016 1,499- i
Sony RX10 II« » 5.1 in 3.5 in 4.0 in 28.7 oz 400 Y Jun 2015 1,299- i

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: Pentax K-3 II vs Canon G1 X Mark III

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. 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.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the G1X Mark III is 10 percent smaller. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Pentax K-3 II and Canon G1 X Mark III sensor measures

With 24.1MP, the K-3 II offers a slightly higher resolution than the G1X Mark III (24MP), but the K-3 II nevertheless has larger individual pixels (pixel pitch of 3.90μm versus 3.72μm for the G1X Mark III) due to its larger sensor. However, the G1X Mark III is a somewhat more recent model (by 2 years and 5 months) than the K-3 II, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the K-3 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

Unlike the G1X Mark III, the K-3 II has the capacity to capture high quality composite images 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).

K-3 II versus G1X Mark 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 adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

Sensor Characteristics
  Camera Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Pentax K-3 II» APS-C 24.1 6016 40001080/60i23.613.6110680
Canon G1 X Mark III« APS-C 24.0 6000 40001080/60p----
Canon 6D Mark II« » Full Frame 26.0 6240 41601080/60p24.411.9286285
Canon 80D« » APS-C 24.0 6000 40001080/60p23.613.2113579
Canon 1D X Mark II« » Full Frame 20.0 5472 36484K/60p24.113.5320788
Nikon D7500« » APS-C 20.7 5568 37124K/30p24.314.0148386
Nikon D7200« » APS-C 24.0 6000 40001080/60p24.514.6133387
Olympus E-M1 II« » Four Thirds 20.2 5184 38884K/30p23.712.8131280
Olympus E-M5 II« » Four Thirds 15.9 4608 34561080/60p23.012.584273
Panasonic GX8« » Four Thirds 20.2 5184 38884K/30p23.512.680675
Pentax KP« » APS-C 24.1 6016 40001080/60i----
Pentax K-70« » APS-C 24.0 6000 40001080/60i----
Pentax K-3« » APS-C 24.1 6016 40001080/60i23.713.4121680
Pentax K-5« » APS-C 16.1 4928 32641080/25p23.714.1116282
Sony RX10 III« » 1-inch 20.0 5472 36484K/30p23.112.647270
Sony RX10 II« » 1-inch 20.0 5472 36484K/30p23.012.653170

Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the G1X Mark III provides a faster frame rate than the K-3 II. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.

 

Feature comparison: Pentax K-3 II vs Canon G1 X Mark III

Apart from body and sensor, cameras can and do differ across a range of features. For example, the G1X Mark III has an electronic viewfinder (2360k dots), while the K-3 II has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The table below summarizes some of the other core capabilities of the Pentax K-3 II and Canon G1 X Mark III in connection with corresponding information for a sample of similar cameras. If you need more detail on the specs, you can find comprehensive listings, for example, in the dpreview camera hub.

Core Features
  Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(yes/no)
Build-in
Image
Stab
Pentax K-3 II»optical Y 3.2 1037 fixed n 8000 8.3 n Y
Canon G1 X Mark III«2360 n 3.0 1040 swivel Y 2000 9.0 Y Y
Canon 6D Mark II« »optical Y 3.0 1040 swivel Y 4000 6.5 n n
Canon 80D« »optical Y 3.0 1040 swivel Y 8000 7.0 Y n
Canon 1D X Mark II« »optical Y 3.2 1620 fixed Y 8000 16.0 n n
Nikon D7500« »optical Y 3.2 922 tilting Y 8000 8.0 Y n
Nikon D7200« »optical Y 3.2 1229 fixed n 8000 6.0 Y n
Olympus E-M1 II« »2360 n 3.0 1037 swivel Y 8000 18.0 n Y
Olympus E-M5 II« »2360 n 3.0 1037 swivel Y 8000 10.0 n Y
Panasonic GX8« »2360 n 3.0 1040 swivel Y 8000 10.0 n Y
Pentax KP« »optical n 3.0 921 tilting n 6000 7.0 Y Y
Pentax K-70« »optical n 3.0 921 swivel n 6000 6.0 Y Y
Pentax K-3« »optical Y 3.2 1037 fixed n 8000 8.3 Y Y
Pentax K-5« »optical Y 3.0 921 fixed n 8000 7.0 Y Y
Sony RX10 III« »2359 Y 3.0 1229 tilting n 2000 14.0 Y Y
Sony RX10 II« »2359 Y 3.0 1229 tilting n 3200 14.0 Y Y

Both the K-3 II and the G1X Mark III are current models that good online retailers will have in stock. You can check the latest prices, for example, at amazon. The K-3 II replaced the earlier Pentax K-3, while the G1X Mark III followed on from the Canon G1 X Mark II.

Review summary: Pentax K-3 II vs Canon G1 X Mark III

So how do things add up? Is there a clear favorite between the Pentax K-3 II and the Canon G1 X Mark III? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Pentax K-3 II:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier setting verification: Has an LCD display on top to control shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 2000/sec) to freeze action.
  • More flexible: Can take a variety of interchangeable lenses, including specialty optics.
  • Longer lasting: Can take more shots (720 versus 200) on a single battery charge.
  • More heavily discounted: Has been available for much longer (launched in April 2015).

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Advantages of the Canon PowerShot G1 X Mark III:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More flexible LCD: Has swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Ready to shoot: Comes with an integrated lens, while the K-3 II requires a separate lens.
  • More compact: Is smaller (115x78mm vs 131x100mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight even though it has a lens build in (unlike the K-3 II).
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • More modern: Reflects 2 years and 5 months of technical progress since the K-3 II launch.

If the count of relative strengths (bullet points above) is taken as a measure, the G1X Mark III comes out slightly ahead of the K-3 II (10 : 9 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.

K-3 II 09:10 G1X Mark III

In any case, while the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the K-3 II or the G1X Mark 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 where reviews by experts come in. The adjacent table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The full reviews are available by clicking on the site logo in the table header.

Review scores
  Camera cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Pentax K-3 II»--5/54.5/55/5 Apr 2015 1,099 i i
Canon G1 X Mark III«Rec79/1004.5/5-4.5/5 Oct 2017 1,299 i i
Canon 6D Mark II« »Rec80/1004.5/54/54/5 Jun 2017 1,999 i i
Canon 80D« »HiRec84/1004.5/54.5/54.5/5 Feb 2016 1,199 i i
Canon 1D X Mark II« »-89/1004.5/55/54.5/5 Feb 2016 5,999 i i
Nikon D7500« »HiRec86/1005/54.5/54.5/5 Apr 2017 1,299 i i
Nikon D7200« »HiRec84/1004.5/54/54.5/5 Mar 2015 1,199- i
Olympus E-M1 II« »HiRec85/1004.5/55/54.5/5 Sep 2016 1,999 i i
Olympus E-M5 II« »HiRec81/1005/54.5/55/5 Feb 2015 1,099 i i
Panasonic GX8« »Rec82/1004.5/55/54.5/5 Jul 2015 1,199- i
Pentax KP« »-82/1005/5-4.5/5 Jan 2017 1,099 i i
Pentax K-70« »-79/1004.5/54/54.5/5 Jun 2016 649 i i
Pentax K-3« »-83/1005/54.5/55/5 Oct 2013 1,299- i
Pentax K-5« »-83/1005/54.5/54.5/5 Sep 2010 1,099- i
Sony RX10 III« »Rec84/1004.5/54.5/54.5/5 Mar 2016 1,499- i
Sony RX10 II« »HiRec82/1004.5/54.5/54/5 Jun 2015 1,299- i

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 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.

 

Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored. If you do not see the camera that you are looking for, kindly get in touch, and I will try to update the database with the necessary infos.

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