Below you can see the front view size comparison of Sony A6000 and Sony A7. Sony A6000 is clearly the smaller of the two cameras. Its body is 7mm narrower, 27mm shorter and 3mm thinner than Sony A7.
Sony A6000 vs Sony A7 - Front View
Sony A6000 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