Below you can see the front view size comparison of Casio EX-100 and Panasonic GX7. Casio EX-100 is clearly the smaller of the two cameras. Its body is 4mm narrower, 4mm shorter and 5mm thinner than Panasonic GX7.
Casio EX-100 vs Panasonic GX7 - Front View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison