Both Fujifilm X10 and Fujifilm X-S1 have 2/3-inch sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the X10 and X-S1 sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm X10 and Fujifilm X-S1 Cameras
Fujifilm X10 and Fujifilm X-S1 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
Both Fujifilm X10 and Fujifilm X-S1 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, X10 has scored 50, 1 points higher than X-S1.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Fujifilm X10
50
20.5 bits
11.3 Evs
245 ISO
Fujifilm X-S1
49
20.4 bits
11.2 Evs
216 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
Fujifilm X10
or the
Fujifilm X-S1 ,
including hyperfocal distance.
