FujiFilm S2800HD has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Olympus SZ-16 iHS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the S2800HD and SZ-16 iHS sensor size comparison.
FujiFilm S2800HD and Olympus SZ-16 iHS 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.