Both Panasonic FX75 and Olympus TG-320 have 1/2.3-inch sized 14.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the FX75 and TG-320 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FX75 and Olympus TG-320 Cameras
Panasonic FX75 and Olympus TG-320 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 FX75
or the
Olympus TG-320 ,
including hyperfocal distance.
