Panasonic FZ28 has a
10.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Olympus VG-120 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III processor.
Below you can see the FZ28 and VG-120 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FZ28 and Olympus VG-120 Cameras
Panasonic FZ28 and Olympus VG-120 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
Panasonic FZ28
or the
Olympus VG-120 ,
including hyperfocal distance.