For example you mentioned it has a 800:1 contrast ratio.
My Samsung Captivate has a Super AMOLED screen with a 50,000:1 contrast ratio and produces much superior colors from my standpoint. iPhone 4 beats it in whites I believe.
I also heard that Retina display requires a back light, AMOLED does not.
Vita display probably also requires one, but if this thread is about wanting it to have a superior screen to what it has now, you would need to be asking for an AMOLED.
it wouldn't be an "OLED" if it needed a back light man
I know so called "LED TVs", which actually have a LCD screen and LED backlight, made things confusing, but all OLEDs are self luminous
btw amoleds from a technical standpoint are worse then oleds in picture quality as they group together sub pixels of the same color to deal with the relatively short life of blue colored oleds, so their pixels are bigger/there is more aliasing - that shoudn't have that much of an effect on real visible quality though, especially in high pixel density screens