Both Canon 80D and Sony A77 have 24.0 MP resolution sensors but Canon 80D's sensor is APS-C (22.5 x 15 mm ) and Sony A77's sensor is APS-C (23.5 x 15.6 mm ).
Since Sony A77'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 A77 sensor size comparison.
Canon 80D and Sony A77 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
Both Canon 80D and Sony A77 sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, 80D has scored 79, 1 points higher than A77.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 80D |
79 |
23.6 bits |
13.2 Evs |
1135 ISO |
Sony A77 |
78 |
24.0 bits |
13.2 Evs |
801 ISO |