Canon M6 MII has a
33.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features DIGIC 8 processor. On the other hand, Sony HX350 has a
20.0MP (1/2. ) sized BSI-CMOS sensor and features BIONZ X processor.
Canon M6 MII's sensor provides 13MP more than Sony HX350's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the M6 II and HX350 sensor size comparison.
As seen above, Canon M6 MII has a infx Larger sensor area than Sony HX350. 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.