Sony W220 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Panasonic FS7 has a
10.0MP 1/2.5-inch (5.744 x 4.308 mm ) sized CCD sensor .
Below you can see the W220 and FS7 sensor size comparison.
As seen above, Sony W220 has a 1.1x Larger sensor area than Panasonic FS7. 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.