Ricoh WG-6 has a
20.0MP (1/2. ) sized BSI-CMOS sensor . On the other hand, Olympus SZ-31MR iHS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Dual TruePic V processor.
Below you can see the WG-6 and SZ-31MR iHS sensor size comparison.
As seen above, Olympus SZ-31MR iHS 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.