Both Sony A7 and Nikon D610 have Full frame sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the A7 and D610 sensor size comparison.
Sony A7 and Nikon D610 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 A7 and Nikon D610 sensors have been tested by DxO and the results show that D610 has a better overall score of 94, 4 points higher compared to A7's score of 90.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7 |
90 |
24.8 bits |
14.2 Evs |
2248 ISO |
Nikon D610 |
94 |
25.1 bits |
14.4 Evs |
2925 ISO |