Both Sony A9 II and Nikon D750 have 24.0 MP resolution sensors but Sony A9 II's sensor is Full frame (35.6 x 23.8 mm ) and Nikon D750's sensor is Full frame (35.9 x 24 mm ).
Since Nikon D750'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 Sony A9 II.
Below you can see the A9 Mark II and D750 sensor size comparison.
Sony A9 II and Nikon D750 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A9 II |
93 |
25.0 bits |
14.0 Evs |
3434 ISO |
Nikon D750 |
93 |
24.8 bits |
14.5 Evs |
2956 ISO |