Both Canon M6 and Sony A6000 have APS-C sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the M6 and A6000 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon M6 and Sony A6000 Cameras
As seen above, Sony A6000 has a 1.1x Larger sensor area than Canon M6. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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 M6 and Sony A6000 sensors have been tested by DxO and the results show that A6000 has a better overall score of 82, 4 points higher compared to M6's score of 78.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon M6
78
23.4 bits
12.6 Evs
1317 ISO
Sony A6000
82
24.1 bits
13.1 Evs
1347 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 M6
or the
Sony A6000 ,
including hyperfocal distance.