Olympus SZ-11 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III+ processor. On the other hand, Olympus SH-3 has a
16.0MP 1/2.3' (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VII processor.
Below you can see the SZ-11 and SH-3 sensor size comparison.
Olympus SZ-11 and Olympus SH-3 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 SZ-11 has 15% larger pixel area compared to Olympus SH-3, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.