Samsung is always criticized for using cheap quality plastics materials and other things in its high end phones. When Samsung has announced that they are going to use Corning Gorilla Glass 3 in Galaxy S IV then they had said that there is nothing cheap in it.
Now a user Szabolcs Ignacz has shared a video on YouTube where he has tested and tried to put scratch on Galaxy S IV using pen, knifes, keys and coins, and at the end Galaxy S IV survives the test with no scratch on it.
Lets take a look at the video :-