Below you can see the front view size comparison of Sony A7 and Canon 80D. Sony A7 is clearly the smaller of the two cameras. Its body is 12mm narrower, 11mm shorter and 31mm thinner than Canon 80D.
Sony A7 vs Canon 80D - Front View
Sony A7 vs Canon 80D - 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