Both Ricoh WG-6 and Nikon A900 have 20.0 MP resolution sensors but Ricoh WG-6's sensor is (1/2. ) and Nikon A900's sensor is 1/2.3 (6.17 x 4.55 mm ).
Since Nikon A900's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Ricoh WG-6.
Below you can see the WG-6 and A900 sensor size comparison.
As seen above, Nikon A900 has a infx Larger sensor area than Ricoh WG-6. 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.