Below you can see the front view size comparison of Sony A6400 and Hasselblad X1D. Sony A6400 is clearly the smaller of the two cameras. Its body is 30mm narrower, 31mm shorter and 11mm thinner than Hasselblad X1D.
Sony A6400 vs Hasselblad X1D - Front View
Sony A6400 vs Hasselblad X1D - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison