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.
Sensor Size and Resolution Comparison image of Sony A7S II and Sony A7S Cameras
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
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony A7S II
or the
Sony A7S ,
including hyperfocal distance.
