Below you can see the front-view size comparison of the Olympus XZ-2 iHS and Panasonic G7. The Olympus XZ-2 iHS is clearly the smaller of the two cameras. Its body is 12mm narrower, 21 mm shorter and 29 mm thinner than the Panasonic G7.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.