Both Leica V-Lux 30 and Fujifilm JZ100 have 1/2.3-inch sized 14.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the V-Lux 30 and JZ100 sensor size comparison.
Sensor Size and Resolution Comparison image of Leica V-Lux 30 and Fujifilm JZ100 Cameras
Leica V-Lux 30 and Fujifilm JZ100 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 V-Lux 30
or the
Fujifilm JZ100 ,
including hyperfocal distance.