Below you can see the front-view size comparison of the Fujifilm XQ2 and Olympus XZ-2 iHS. The Fujifilm XQ2 is clearly the smaller of the two cameras. Its body is 13mm narrower, 6 mm shorter and 15 mm thinner than the Olympus XZ-2 iHS.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.