Below you can see the front view size comparison of Samsung NX30 and Samsung NX300. Samsung NX300 is clearly the smaller of the two cameras. Its body is 5mm narrower, 32mm shorter and 17mm thinner than Samsung NX30.
Samsung NX30 vs Samsung NX300 - Front View
Samsung NX30 vs Samsung NX300 - 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