Samsung ST80 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Fujifilm S9800 has a
16.0MP 1/2.3 (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the ST80 and S9800 sensor size comparison.
Samsung ST80 and Fujifilm S9800 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.