Olympus VG-160 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Olympus SH-50 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VI processor.
Below you can see the VG-160 and SH-50 sensor size comparison.
Olympus VG-160 and Olympus SH-50 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 VG-160 has 15% larger pixel area compared to Olympus SH-50, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.