Ricoh GXR A12 50mm has a
12.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor and features GR engine III processor. On the other hand, Leica CL has a
24.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor and features Maestro II processor.
Leica CL's sensor provides 12MP more than Ricoh GXR A12 50mm'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 GXR A12 50mm F2.5 Macro and CL sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GXR A12 50mm and Leica CL Cameras
Ricoh GXR A12 50mm and Leica CL have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Ricoh GXR A12 50mm has 97% larger pixel area compared to Leica CL, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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
Ricoh GXR A12 50mm
or the
Leica CL ,
including hyperfocal distance.