Samsung ST80 has a 14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Fujifilm XQ2 has a 12.0MP 2/3-inch (8.8 x 6.6 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor.
Below you can see the ST80 and XQ2 sensor size comparison.
As seen above, Fujifilm XQ2 has a 2.1x Larger sensor area than Samsung ST80. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.