Both Canon G9 X II and Sony RX100 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 G9 X II and RX100 III sensor size comparison.
Sensor Size and Resolution Comparison image of Canon G9 X II and Sony RX100 III Cameras
Canon G9 X II and Sony RX100 III 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
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 G9 X II and Sony RX100 III sensors have been tested by DxO and the results show that RX100 III has a better overall score of 67, 2 points higher compared to G9 X II's score of 65.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon G9 X II
65
21.9 bits
12.5 Evs
522 ISO
Sony RX100 III
67
22.4 bits
12.3 Evs
495 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 G9 X II
or the
Sony RX100 III ,
including hyperfocal distance.
