Leica X1 has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor . On the other hand, Fujifilm X70 has a
16.0MP APS-C (23.6 x 15.6 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor.
Below you can see the X1 and X70 sensor size comparison.
Sensor Size and Resolution Comparison image of Leica X1 and Fujifilm X70 Cameras
Leica X1 and Fujifilm X70 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.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Leica X1
or the
Fujifilm X70 ,
including hyperfocal distance.