Panasonic GH3 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine VII FHD processor. On the other hand, Sony A7S III has a
12.0MP Full frame (35.6 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor.
Below you can see the GH3 and A7S III sensor size comparison.
As seen above, Sony A7S III has a 3.8x Larger sensor area than Panasonic GH3. 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. Panasonic GH3 and Sony A7S III sensors have been tested by DxO and the results show that A7S III has a better overall score of 85, 14 points higher compared to GH3's score of 71.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic GH3 |
71 |
22.7 bits |
12.4 Evs |
812 ISO |
Sony A7S III |
85 |
24.2 bits |
13.4 Evs |
3900 ISO |