Both Ricoh GR II and Olympus E-M1 have 16.0 MP resolution sensors but Ricoh GR II's sensor is APS-C (23.7 x 15.7 mm ) and Olympus E-M1's sensor is Four Thirds (17.3 x 13 mm ).
Since Ricoh GR II's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Olympus E-M1.
Below you can see the GR II and E-M1 sensor size comparison.
As seen above, Ricoh GR II has a 1.7x Larger sensor area than Olympus E-M1. 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.
DxOMark Sensor Scores
Both Ricoh GR II and Olympus E-M1 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, GR II has scored 80, 7 points higher than E-M1.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Ricoh GR II |
80 |
23.6 bits |
13.7 Evs |
1078 ISO |
Olympus E-M1 |
73 |
23.0 bits |
12.7 Evs |
757 ISO |