Ricoh GXR Mount A12 has a
12.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor . On the other hand, Nikon S9300 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the GXR Mount A12 and S9300 sensor size comparison.
As seen above, Ricoh GXR Mount A12 has a 13.2x Larger sensor area than Nikon S9300. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.