Both Panasonic G1 and Panasonic G10 have Four Thirds sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the G1 and G10 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G1 and Panasonic G10 Cameras
Panasonic G1 and Panasonic G10 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 Panasonic G1 and Panasonic G10 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, G1 has scored 53, 1 points higher than G10.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Panasonic G1
53
21.1 bits
10.3 Evs
463 ISO
Panasonic G10
52
21.2 bits
10.1 Evs
411 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
Panasonic G1
or the
Panasonic G10 ,
including hyperfocal distance.