Canon S120 has a
12.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized BSI-CMOS sensor and features Digic 6 processor. On the other hand, Samsung Galaxy Camera 4G has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features 1.4GHz Quad-Core processor.
Below you can see the S120 and Galaxy Camera 4G sensor size comparison.
As seen above, Canon S120 has a 1.5x Larger sensor area than Samsung Galaxy Camera 4G. 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.