Kodak Z915 has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Panasonic FX78 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine FHD processor.
Below you can see the Z915 and FX78 sensor size comparison.
Sensor Size and Resolution Comparison image of Kodak Z915 and Panasonic FX78 Cameras
Kodak Z915 and Panasonic FX78 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
Kodak Z915
or the
Panasonic FX78 ,
including hyperfocal distance.