Default [Q] Lost X Reality engine on Xperia Z1

Bought the new Xperia Z1 C6903 running on 4.2, wanted to root it so unlocked the bootloader to downgrade but forgot to back up the TA. Also the camera stopped working, so i relocked the bootloader and updated the phone to 4.3 using PC companion and got the camera working but wanted to know:
1.If i got X reality engine back or not?
2.If not then how do i get it back?
3.What are the main disadvantages of not having the X reality engine?

P.S.In display options in settings the option for X reality is available on my phone (4.3v)