Nikon S8200 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Expeed C2 processor. On the other hand, Olympus XZ-10 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the S8200 and XZ-10 sensor size comparison.
Nikon S8200 and Olympus XZ-10 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 Olympus XZ-10 has 35% larger pixel area (2.38µm2 vs 1.76µm2) compared to Nikon S8200, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.