Panasonic FP8 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine V processor. On the other hand, Panasonic FP5 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine IV processor.
Below you can see the FP8 and FP5 sensor size comparison.
Panasonic FP8 and Panasonic FP5 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Panasonic FP8 has 16% larger pixel area compared to Panasonic FP5, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.