Leica V-Lux 40 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor . On the other hand, Leica V-Lux 3 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the V-Lux 40 and V-Lux 3 sensor size comparison.
Sensor Size and Resolution Comparison image of Leica V-Lux 40 and Leica V-Lux 3 Cameras
Leica V-Lux 40 and Leica V-Lux 3 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 40
or the
Leica V-Lux 3 ,
including hyperfocal distance.