I have the L735 and a Samsung Galaxy S3 mini, both have AMOLED screens. As I understand it, being ORGANIC, the colours will fade over time, with blue fading fastest. Also, if you keep a static screen on for long periods with screen brightness set to max, burn in will happen. Look at the demo handsets in stores to see what this look like.
There are no signs of burn in on the S3 mini after 6 months of daily use.
I have dark colours on my L735 - black background, wallpaper is solid grey so live tiles are very dark, and screen brightness is set to auto. I think the screen will be free of burn in for a a couple of years! Burn in is not something that concerns me; if it happens, it will be the 'soft buttons' at the bottom of the screen. (Wish I could turn from from White to my chosen theme colour, not just their background.)