Ricoh GXR A16 24-85mm has a
16.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor and features Smooth Imaging Engine IV processor. On the other hand, Samsung NX200 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor .
Below you can see the GXR A16 24-85mm F3.5-5.5 and NX200 sensor size comparison.
Ricoh GXR A16 24-85mm and Samsung NX200 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.