Samsung Galaxy Camera 2 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features 1.6GHz Quad-Core Exynos processor. On the other hand, Casio EX-S12 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the Galaxy Camera 2 and EX-S12 sensor size comparison.
Samsung Galaxy Camera 2 and Casio EX-S12 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-S12 has 32% larger pixel area (2.34µm2 vs 1.76µm2) compared to Samsung Galaxy Camera 2, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.