Casio EX-FS10 has a
9.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Fujifilm S8100fd has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the EX-FS10 and S8100fd sensor size comparison.
Casio EX-FS10 and Fujifilm S8100fd 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 Casio EX-FS10 has 11% larger pixel area compared to Fujifilm S8100fd, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.