Both Canon M6 and Canon R3 have 24.0 MP resolution sensors but Canon M6's sensor is APS-C (22.3 x 14.9 mm ) and Canon R3's sensor is Full frame (36 x 24 mm ).
Since Canon R3's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Canon M6.
Below you can see the M6 and R3 sensor size comparison.
As seen above, Canon R3 has a 2.6x Larger sensor area than Canon M6. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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. Canon M6 and Canon R3 sensors have been tested by DxO and the results show that R3 has a better overall score of 96, 18 points higher compared to M6's score of 78.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon M6 |
78 |
23.4 bits |
12.6 Evs |
1317 ISO |
Canon R3 |
96 |
25.0 bits |
14.7 Evs |
4086 ISO |