Below you can see the front-view size comparison of the Fujifilm HS35EXR and Panasonic FZ2500. The Fujifilm HS35EXR is clearly the smaller of the two cameras. Its body is 7mm narrower, 5 mm shorter and 9 mm thinner than the Panasonic FZ2500.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.