Both Panasonic GX7 and Olympus E-M5 II have 16.0 MP resolution sensors but Panasonic GX7's sensor is Four Thirds (17.3 x 13 mm ) and Olympus E-M5 II's sensor is Four Thirds (17.3 x 13 mm ).
Since Olympus E-M5 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 Panasonic GX7.
Below you can see the GX7 and E-M5 Mark II sensor size comparison.
Panasonic GX7 and Olympus E-M5 II 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.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Panasonic GX7 and Olympus E-M5 II sensors have been tested by DxO and the results show that E-M5 Mark II has a better overall score of 73, 3 points higher compared to GX7's score of 70.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic GX7 |
70 |
22.6 bits |
12.2 Evs |
718 ISO |
Olympus E-M5 II |
73 |
23.0 bits |
12.4 Evs |
896 ISO |