Below you can see the front-view size comparison of the Olympus XZ-10 and Olympus XZ-2 iHS. The Olympus XZ-10 is clearly the smaller of the two cameras. Its body is 11mm narrower, 4 mm shorter and 14 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.