Both Panasonic GX85 and Olympus E-M5 have 16.0 MP resolution sensors but Panasonic GX85's sensor is Four Thirds (17.3 x 13 mm ) and Olympus E-M5's sensor is Four Thirds (17.3 x 13 mm ).
Since Olympus E-M5'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 GX85.
Another difference between these two cameras is that Panasonic GX85's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the GX85 and E-M5 sensor size comparison.
Panasonic GX85 and Olympus E-M5 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic GX85 |
71 |
22.9 bits |
12.6 Evs |
662 ISO |
Olympus E-M5 |
71 |
22.8 bits |
12.3 Evs |
826 ISO |