Both Sony A7S II and Sony A7S have Full frame sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the A7S II and A7S sensor size comparison.
Sony A7S II and Sony A7S have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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 A7S II and Sony A7S sensors have been tested by DxO and the results show that A7S has a better overall score of 87, 2 points higher compared to A7S II's score of 85.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7S II |
85 |
23.6 bits |
13.3 Evs |
2993 ISO |
Sony A7S |
87 |
23.9 bits |
13.2 Evs |
3702 ISO |