Nikon P530 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, FujiFilm S2800HD has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the P530 and S2800HD sensor size comparison.
Nikon P530 and FujiFilm S2800HD 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 FujiFilm S2800HD has 15% larger pixel area (2.04µm2 vs 1.76µm2) compared to Nikon P530, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.