Both Fujifilm F550 EXR and Samsung Galaxy Camera 2 have 16.0 MP resolution sensors but Fujifilm F550 EXR's sensor is 1/2-inch (6.4 x 4.8 mm ) and Samsung Galaxy Camera 2's sensor is 1/2.3-inch (6.17 x 4.55 mm ).
Since Fujifilm F550 EXR's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Samsung Galaxy Camera 2.
Below you can see the F550 EXR and Galaxy Camera 2 sensor size comparison.
Fujifilm F550 EXR and Samsung Galaxy Camera 2 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.