Panasonic LX100 has a 13.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor. On the other hand, Leica X Vario has a 16.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor .
Below you can see the LX100 and X Vario sensor size comparison.
As seen above, Leica X Vario has a 1.7x Larger sensor area than Panasonic LX100. 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.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Panasonic LX100 and Leica X Vario sensors have been tested by DxO and the results show that X Vario has a better overall score of 78, 11 points higher compared to LX100's score of 67.