Both Canon S90 and Canon S95 have 1/1.7-inch sized 10.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the S90 and S95 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon S90 and Canon S95 Cameras
Canon S90 and Canon S95 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
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. Canon S90 and Canon S95 sensors have been tested by DxO and the results show that S95 has a better overall score of 47, 1 points higher compared to S90's score of 46.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon S90
46
20.2 bits
11.0 Evs
185 ISO
Canon S95
47
20.4 bits
11.3 Evs
153 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
Canon S90
or the
Canon S95 ,
including hyperfocal distance.
