Samsung ST93 has a
16.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized CCD sensor . On the other hand, Sony WX5 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Bionz processor.
Below you can see the ST93 and WX5 sensor size comparison.
Samsung ST93 and Sony WX5 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.