Canon SX120 IS has a 10.0MP 1/2.5-inch (5.744 x 4.308 mm ) sized CCD sensor and features Digic 4 processor. On the other hand, Nikon S32 has a 13.0MP 1/3-inch (4.8 x 3.6 mm ) sized CCD sensor .
Below you can see the SX120 IS and S32 sensor size comparison.
As seen above, Canon SX120 IS has a 1.4x Larger sensor area than Nikon S32. 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.