Ricoh G900 has a
20.0MP (1/2. ) sized BSI-CMOS sensor . On the other hand, Olympus SZ-30MR has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features TruePic III+ processor.
Below you can see the G900 and SZ-30MR sensor size comparison.
As seen above, Olympus SZ-30MR has a infx Larger sensor area than Ricoh G900. 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.