I have heard it has glass on front as well as rear. Should i put a screen protector on rear also to avoid scratches? I shall always put a case on it. I am going to buy it within next few weeks.
If you are going to use a case I personally don't see a need for a screen protector on the back. I use a TPU case (Bugdroid) and a screen protector on the front. Works great and my Z3 is in fine shape after 6 weeks including a two week trip to Europe.