Sony A6300 has a 24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features BIONZ X processor. On the other hand, Leica TL has a 16.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor .
Sony A6300's sensor provides 8MP more than Leica TL'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 A6300 and TL sensor size comparison.
Sony A6300 and Leica TL 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.