Both Canon R8 and Sony A99 have 24.0 MP resolution sensors but Canon R8's sensor is Full frame (36 x 24 mm ) and Sony A99's sensor is Full frame (35.8 x 23.8 mm ).
Since Canon R8'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 Sony A99.
Below you can see the R8 and A99 sensor size comparison.
Canon R8 and Sony A99 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 R8 and Sony A99 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, R8 has scored 93, 4 points higher than A99.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon R8 |
93 |
24.5 bits |
14.5 Evs |
3295 ISO |
Sony A99 |
89 |
25.0 bits |
14.0 Evs |
1555 ISO |