Below you can see the front view size comparison of Samsung NX2000 and Pentax K-3 II. Samsung NX2000 is clearly the smaller of the two cameras. Its body is 12mm narrower, 35mm shorter and 41mm thinner than Pentax K-3 II.
Samsung NX2000 vs Pentax K-3 II - Front View 
Samsung NX2000 vs Pentax K-3 II - 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