But key here is we're talking very very tiny differences and its not the same to everyones eyes. I find the total black too harsh, and I can see jagged edges (like I can on my Apple Watch) but the biggest issue is I demand black text on a white background and if you start doing that on an AMOLED screen like Samsung you have to have white text on a black background on the battery will drain in twice the speed - which is not acceptable. I don't want to half my battery life and I don't want white writing on a black background, it feels like i'm using DOS again!!
I think OLED is the future of large scale TV's where power consumption doesn't matter (so long as they get the over saturation correct) but I think its flawed for mobile devices. I expect Apple will employ some form of nano crystal LCD over type which ironically is the technology Samsung are going for instead of OLED in their large screen TV's ha.
How old is that device you are describing? Your description is the older AMOLED tech, not the new stuff.