Fujifilm XF10 has a 24.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor . On the other hand, Leica X Vario has a 16.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor .
Fujifilm XF10's sensor provides 8MP more than Leica X Vario'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 XF10 and X Vario sensor size comparison.
Fujifilm XF10 and Leica X Vario have almost the same sensor size so none of them has any significant advantage over other in providing control over depth of field when used with same focal length and aperture.