Sony A9 has a
24.0MP Full frame (35.6 x 23.8 mm ) sized Stacked BSI-CMOS sensor and features BIONZ X processor. On the other hand, Leica M11 Monochrom has a
60.0MP Full frame (36 x 24 mm ) sized Monochrome BSI-CMOS sensor and features Maestro III processor.
Leica M11 Monochrom's sensor provides 36MP more than Sony A9's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the A9 and M11 Monochrom sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A9 and Leica M11 Monochrom Cameras
Sony A9 and Leica M11 Monochrom 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. Sony A9 and Leica M11 Monochrom sensors have been tested by DxO and the results show that M11 Monochrom has a better overall score of 100, 8 points higher compared to A9's score of 92.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A9
92
24.9 bits
13.3 Evs
3517 ISO
Leica M11 Monochrom
100
26.3 bits
14.8 Evs
3376 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony A9
or the
Leica M11 Monochrom ,
including hyperfocal distance.
