Sony WX1 has a
10.0MP 1/2.4-inch (6.104 x 4.578 mm ) sized BSI-CMOS sensor and features Bionz processor. On the other hand, 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.
Below you can see the WX1 and GXR A12 50mm F2.5 Macro sensor size comparison.
As seen above, Ricoh GXR A12 50mm has a 13.3x Larger sensor area than Sony WX1. 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.