Samsung ST80 has a 14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Fujifilm XQ1 has a 12.0MP 2/3-inch (8.8 x 6.6 mm ) sized CMOS X-TRANS II sensor .
Below you can see the ST80 and XQ1 sensor size comparison.
As seen above, Fujifilm XQ1 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.