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. On the other hand, Sony HX200V has a
18.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor.
Below you can see the SX30 IS and HX200V sensor size comparison.
Canon SX30 IS and Sony HX200V 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 28% larger pixel area compared to Sony HX200V, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.