Nikon S5100 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Expeed C2 processor. On the other hand, Nikon S5200 has a
16.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized BSI-CMOS sensor .
Below you can see the S5100 and S5200 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon S5100 and Nikon S5200 Cameras
Nikon S5100 and Nikon S5200 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 S5100
or the
Nikon S5200 ,
including hyperfocal distance.