Below you can see the front-view size comparison of the Casio EX-10 and Olympus E-PL7. The Olympus E-PL7 is clearly the smaller of the two cameras. Its body is 5 mm narrower, 1 mm shorter and 11 mm thinner than the Casio EX-10.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.