Nikon 1 S2 has a 14.0MP 1" (13.1 x 8.8 mm ) sized CMOS sensor and features Expeed 4A processor. On the other hand, Ricoh GXR S10 24-72mm F2.5-4.4 VC has a 10.0MP 1/1.7" (7.44 x 5.58 mm ) sized CCD sensor and features Smooth Imaging Engine IV processor.
Below you can see the 1 S2 and GXR S10 24-72mm F2.5-4.4 VC sensor size comparison.
As seen above, Nikon 1 S2 has a 2.8x Larger sensor area than Ricoh GXR S10 24-72mm F2.5-4.4 VC. 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.