Both Panasonic GX85 and Panasonic GH4 have 16.0 MP resolution sensors but Panasonic GX85's sensor is Four Thirds (17.3 x 13 mm ) and Panasonic GH4's sensor is Four Thirds (17.3 x 13 mm ).
Since Panasonic GH4'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 GH4 sensor size comparison.
Panasonic GX85 and Panasonic GH4 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 GX85 and Panasonic GH4 sensors have been tested by DxO and the results show that GH4 has a better overall score of 74, 3 points higher compared to GX85's score of 71.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic GX85 |
71 |
22.9 bits |
12.6 Evs |
662 ISO |
Panasonic GH4 |
74 |
23.2 bits |
12.8 Evs |
791 ISO |