Below you can see the front-view size comparison of the Olympus E-M1 II and Hasselblad X1D. The Olympus E-M1 II is clearly the smaller of the two cameras. Its body is 16mm narrower, 7 mm shorter and 4 mm thinner than the Hasselblad X1D.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.