Nikon 1 S2 has a
14.2MP 1' (13.1 x 8.8 mm ) sized CMOS sensor and features Expeed 4A processor. On the other hand, Nikon 1 V3 has a
18.0MP 1' (13.2 x 8.8 mm ) sized CMOS sensor and features Expeed 4A processor.
Below you can see the 1 S2 and 1 V3 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon 1 S2 and Nikon 1 V3 Cameras
Nikon 1 S2 and Nikon 1 V3 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
Nikon 1 S2
or the
Nikon 1 V3 ,
including hyperfocal distance.