Canon SX70 HS has a
20.0MP (1/2. ) sized BSI-CMOS sensor and features Digic 8 processor. On the other hand, Leica V-Lux 20 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Canon SX70 HS's sensor provides 8MP more than Leica V-Lux 20'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 SX70 HS and V-Lux 20 sensor size comparison.
As seen above, Leica V-Lux 20 has a infx Larger sensor area than Canon SX70 HS. 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.