Below you can see the front view size comparison of Panasonic LX100 and Sony A7. Panasonic LX100 is 12mm narrower and 28mm shorter than Sony A7 but it is also 7mm thicker.
Panasonic LX100 vs Sony A7 - Front View
Panasonic LX100 vs Sony A7 - 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