Both Panasonic G2 and Olympus E-PL3 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 G2 and E-PL3 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic G2 and Olympus E-PL3 Cameras
Panasonic G2 and Olympus E-PL3 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 G2 and Olympus E-PL3 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, G2 has scored 53, 1 points higher than E-PL3.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Panasonic G2
53
21.2 bits
10.3 Evs
493 ISO
Olympus E-PL3
52
20.9 bits
10.3 Evs
499 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 G2
or the
Olympus E-PL3 ,
including hyperfocal distance.
