Casio EX-Z800 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Exilim Engine 5.0 processor. On the other hand, Casio EX-Z16 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Exilim Engine 5.0 processor.
Below you can see the EX-Z800 and EX-Z16 sensor size comparison.
Casio EX-Z800 and Casio EX-Z16 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.