Both Sony A58 and Panasonic GH5 II have 20.0 MP resolution sensors but Sony A58's sensor is APS-C (23.2 x 15.4 m ) and Panasonic GH5 II's sensor is Four Thirds (17.3 x 13 mm ).
Since Sony A58'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 GH5 II.
One other difference between these two cameras that is worth mentioning is that Panasonic GH5 II's sensor doesn't have an 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 A58 and GH5 II sensor size comparison.
As seen above, Sony A58 has a 1.5x Larger sensor area than Panasonic GH5 II. 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
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. Sony A58 and Panasonic GH5 II sensors have been tested by DxO and the results show that GH5 II has a better overall score of 79, 5 points higher compared to A58's score of 74.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A58 |
74 |
23.3 bits |
12.5 Evs |
753 ISO |
Panasonic GH5 II |
79 |
23.7 bits |
13.1 Evs |
1136 ISO |