Below you can see the front-view size comparison of the Olympus E-PM2 and Hasselblad X1D. The Olympus E-PM2 is clearly the smaller of the two cameras. Its body is 40mm narrower, 34 mm shorter and 37 mm thinner than the Hasselblad X1D.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.