Both Canon M10 and Leica M-E Typ 220 have 18.0 MP resolution sensors but Canon M10's sensor is APS-C (22.3 x 14.9 mm ) and Leica M-E Typ 220's sensor is Full frame (36 x 24 mm ).
Since Leica M-E Typ 220'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 M10.
Below you can see the M10 and M-E Typ 220 sensor size comparison.
As seen above, Leica M-E Typ 220 has a 2.6x Larger sensor area than Canon M10. 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.