Both Leica M Typ 240 and Sony A9 have 24.0 MP resolution sensors but Leica M Typ 240's sensor is Full frame (36 x 24 mm ) and Sony A9's sensor is Full frame (35.6 x 23.8 mm ).
Since Leica M Typ 240'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 A9.
Below you can see the M Typ 240 and A9 sensor size comparison.
Leica M Typ 240 and Sony A9 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 M Typ 240 and Sony A9 sensors have been tested by DxO and the results show that A9 has a better overall score of 92, 8 points higher compared to M Typ 240's score of 84.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Leica M Typ 240 |
84 |
24.0 bits |
13.3 Evs |
1860 ISO |
Sony A9 |
92 |
24.9 bits |
13.3 Evs |
3517 ISO |