Both Canon 80D and Sony A7 III have 24.0 MP resolution sensors but Canon 80D's sensor is APS-C (22.5 x 15 mm ) and Sony A7 III's sensor is Full frame (35.8 x 23.8 mm ).
Since Sony A7 III'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 80D.
Below you can see the 80D and A7 III sensor size comparison.
As seen above, Sony A7 III has a 2.5x Larger sensor area than Canon 80D. 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 80D and Sony A7 III sensors have been tested by DxO and the results show that A7 III has a better overall score of 96, 17 points higher compared to 80D's score of 79.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 80D |
79 |
23.6 bits |
13.2 Evs |
1135 ISO |
Sony A7 III |
96 |
25.0 bits |
14.7 Evs |
3730 ISO |