Olympus 550WP has a
10.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, FujiFilm S1600 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the 550WP and S1600 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus 550WP and FujiFilm S1600 Cameras
Olympus 550WP and FujiFilm S1600 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
Olympus 550WP
or the
FujiFilm S1600 ,
including hyperfocal distance.