Panasonic FZ200 has a 12.0MP 1/2.3" (6.17 x 4.55 mm ) sized CMOS sensor and features Venus Engine VII FHD processor. On the other hand, Fujifilm S1 has a 16.0MP 1/2.3" (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the FZ200 and S1 sensor size comparison.
Panasonic FZ200 and Fujifilm S1 have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Panasonic FZ200 has 32% larger pixel area compared to Fujifilm S1, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.