Ricoh CX6 has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features Smooth Imaging Engine IV processor. On the other hand, Sony HX350 has a
20.0MP (1/2. ) sized BSI-CMOS sensor and features BIONZ X processor.
Sony HX350's sensor provides 10MP more than Ricoh CX6's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the CX6 and HX350 sensor size comparison.
As seen above, Ricoh CX6 has a infx Larger sensor area than Sony HX350. 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.