Panasonic ZS100 has a
20.0MP 1″ (13.2 x 8.8 mm ) sized MOS sensor and features Venus Engine processor. 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 ZS100 and SZ-31MR iHS sensor size comparison.
As seen above, Panasonic ZS100 has a 4.1x Larger sensor area than Olympus SZ-31MR iHS. 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.