Both Nikon Z6 II and Sony A900 have 25.0 MP resolution sensors but Nikon Z6 II's sensor is Full frame (35.9 x 23.9 mm ) and Sony A900's sensor is Full frame (35.9 x 24 mm ).
Since Sony A900'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 Nikon Z6 II.
Below you can see the Z6 Mark II and A900 sensor size comparison.
Nikon Z6 II and Sony A900 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
Both Nikon Z6 II and Sony A900 sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, Z6 Mark II has scored 94, 15 points higher than A900.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon Z6 II |
94 |
25.0 bits |
14.4 Evs |
3303 ISO |
Sony A900 |
79 |
23.7 bits |
12.3 Evs |
1431 ISO |