Canon G7 X MII has a
20.0MP 1″ (13.2 x 8.8 mm ) sized BSI-CMOS sensor and features DIGIC 7 processor. On the other hand, Canon XC10 has a
12.0MP 1' (12.8 x 9.6 mm ) sized CMOS sensor and features DIGIC DV5 processor.
Canon G7 X MII's sensor provides 8MP more than Canon XC10'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 G7 X MII and XC10 sensor size comparison.
Canon G7 X MII and Canon XC10 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.