Both Canon M100 and Sony A7 have 24.0 MP resolution sensors but Canon M100's sensor is APS-C (22.3 x 14.9 mm ) and Sony A7's sensor is Full frame (35.8 x 23.9 mm ).
Since Sony A7's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Canon M100.
Below you can see the M100 and A7 sensor size comparison.
As seen above, Sony A7 has a 2.6x Larger sensor area than Canon M100. 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.