Ricoh GXR S10 24-72mm has a
10.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CCD sensor and features Smooth Imaging Engine IV processor. On the other hand, Panasonic S1 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine IV processor.
Below you can see the GXR S10 24-72mm F2.5-4.4 VC and S1 sensor size comparison.
As seen above, Ricoh GXR S10 24-72mm has a 1.5x Larger sensor area than Panasonic S1. 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.