Below you can see the front-view size comparison of the Canon G7 X MII and Olympus E-M10 III. The Canon G7 X MII is clearly the smaller of the two cameras. Its body is 16mm narrower, 23 mm shorter and 8 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.