Both Nikon Z9 and Nikon Z8 have Full frame sized 46.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the Z9 and Z8 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon Z9 and Nikon Z8 Cameras
Nikon Z9 and Nikon Z8 have the same sensor sizes so they will provide same level of control over the depth of field when used with 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
Nikon Z9
98
26.3 bits
14.4 Evs
2451 ISO
Nikon Z8
98
26.3 bits
14.2 Evs
2548 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
Nikon Z9
or the
Nikon Z8 ,
including hyperfocal distance.
