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, Canon G1 X has a
14.0MP 1.5-inch (18.7 x 14 mm ) sized CMOS sensor and features Digic 5 processor.
Below you can see the GXR S10 24-72mm F2.5-4.4 VC and G1 X sensor size comparison.
As seen above, Canon G1 X has a 6.3x Larger sensor area than Ricoh GXR S10 24-72mm. 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.