Below you can see the front view size comparison of Samsung NX1 and Canon 6D MII. Samsung NX1 is clearly the smaller of the two cameras. Its body is 5mm narrower, 9mm shorter and 9mm thinner than Canon 6D MII.
Samsung NX1 vs Canon 6D MII - Front View
Samsung NX1 vs Canon 6D MII - 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