Ricoh WG-6 has a 20.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Olympus VH-515 has a 12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic III+ processor.
Ricoh WG-6's sensor provides 8MP more than Olympus VH-515'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 WG-6 and VH-515 sensor size comparison.
![Ricoh WG-6 vs Olympus VH-515 Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Ricoh WG-6 and Olympus VH-515 Cameras
Ricoh WG-6 and Olympus VH-515 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.