Below you can see the front view size comparison of Panasonic LX100 and Panasonic GX8. Panasonic LX100 is clearly the smaller of the two cameras. Its body is 18mm narrower, 12mm shorter and 8mm thinner than Panasonic GX8.
Panasonic LX100 vs Panasonic GX8 - Front View
Panasonic LX100 vs Panasonic GX8 - Top 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