Below you can see the front-view size comparison of the Fujifilm XQ1 and Olympus E-M10 III. The Fujifilm XQ1 is clearly the smaller of the two cameras. Its body is 22mm narrower, 25 mm shorter and 17 mm thinner than the Olympus E-M10 III.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.