Samsung PL120 has a
14.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized CCD sensor . On the other hand, Samsung ST150F has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the PL120 and ST150F sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung PL120 and Samsung ST150F Cameras
Samsung PL120 and Samsung ST150F 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
Samsung PL120
or the
Samsung ST150F ,
including hyperfocal distance.