Both Leica M10 and Sony A99 have 24.0 MP resolution sensors but Leica M10's sensor is Full frame (35.8 x 23.9 mm ) and Sony A99's sensor is Full frame (35.8 x 23.8 mm ).
Since Leica M10'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 M10 and A99 sensor size comparison.
Leica M10 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
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. Leica M10 and Sony A99 sensors have been tested by DxO and the results show that A99 has a better overall score of 89, 3 points higher compared to M10's score of 86.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Leica M10 |
86 |
24.4 bits |
13.3 Evs |
2133 ISO |
Sony A99 |
89 |
25.0 bits |
14.0 Evs |
1555 ISO |