Sony A9 III has a
24.6MP Full frame (35.6 x 23.8 mm ) sized Global Shutter sensor and features BIONZ XR processor. On the other hand, Canon R has a
30.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features DIGIC 8 processor.
Canon R's sensor provides 5.4MP more than Sony A9 III's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Another difference between these two cameras is that Sony A9 III's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the A9 Mark III and EOS R sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A9 III and Canon R Cameras
Sony A9 III and Canon R have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Sony A9 III and Canon R sensors have been tested by DxO and the results show that EOS R has a better overall score of 89, 2 points higher compared to A9 Mark III's score of 87.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A9 III
87
24.1 bits
13.0 Evs
3224 ISO
Canon R
89
24.5 bits
13.5 Evs
2742 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony A9 III
or the
Canon R ,
including hyperfocal distance.
