Both Panasonic FH1 and Canon G16 have 12.0 MP resolution sensors but Panasonic FH1's sensor is 1/2.3-inch (6.08 x 4.56 mm ) and Canon G16's sensor is 1/1.7-inch (7.44 x 5.58 mm ).
Since Canon G16's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Panasonic FH1.
Below you can see the FH1 and G16 sensor size comparison.
As seen above, Canon G16 has a 1.5x Larger sensor area than Panasonic FH1. 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.