Both Panasonic FZ2500 and Sony RX10 III 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 FZ2500 and RX10 III sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FZ2500 and Sony RX10 III Cameras
Panasonic FZ2500 and Sony RX10 III 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Panasonic FZ2500
70
23.0 bits
12.6 Evs
538 ISO
Sony RX10 III
70
23.1 bits
12.6 Evs
472 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 FZ2500
or the
Sony RX10 III ,
including hyperfocal distance.