GSM arena says the front is Gorilla Glass 3 and the back is Gorilla Glass 5, while the camera is Gorilla Glass 4. Can anyone confirm? I've heard that the Gorilla Glass 5 is much easier to scratch, but is more shatter proof. And from my own experience, Gorilla Glass 3 is excellent at resisting scratches. What do you guys think? I'm sure the back glass will scratch easy, especially if you plan to put a case on it...