Both Canon 80D and Sony A77 II have APS-C sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 80D and A77 II sensor size comparison.
Canon 80D and Sony A77 II 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. Canon 80D and Sony A77 II sensors have been tested by DxO and the results show that A77 II has a better overall score of 82, 3 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 A77 II |
82 |
24.4 bits |
13.4 Evs |
1013 ISO |