Both Canon 7D MII and Canon 6D have 20.0 MP resolution sensors but Canon 7D MII's sensor is APS-C (22.4 x 15 mm ) and Canon 6D's sensor is Full frame (36 x 24 mm ).
Since Canon 6D'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 7D MII.
Below you can see the 7D MII and 6D sensor size comparison.
As seen above, Canon 6D has a 2.6x Larger sensor area than Canon 7D MII. 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 7D MII and Canon 6D sensors have been tested by DxO and the results show that 6D has a better overall score of 82, 12 points higher compared to 7D MII's score of 70.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 7D MII |
70 |
22.4 bits |
11.8 Evs |
1082 ISO |
Canon 6D |
82 |
23.8 bits |
12.1 Evs |
2340 ISO |