Both Canon G3 X and Panasonic FZ2500 have 1″ sized 20.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the G3 X and FZ2500 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon G3 X and Panasonic FZ2500 Cameras
Canon G3 X and Panasonic FZ2500 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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 G3 X and Panasonic FZ2500 sensors have been tested by DxO and the results show that FZ2500 has a better overall score of 70, 7 points higher compared to G3 X's score of 63.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon G3 X
63
21.4 bits
12.3 Evs
521 ISO
Panasonic FZ2500
70
23.0 bits
12.6 Evs
538 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 G3 X
or the
Panasonic FZ2500 ,
including hyperfocal distance.
