Casio EX-H30 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Exilim Engine 5.0 processor. On the other hand, Canon SX30 IS has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor.
Below you can see the EX-H30 and SX30 IS sensor size comparison.
Casio EX-H30 and Canon SX30 IS 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 Canon SX30 IS has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Casio EX-H30, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.