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This is a copy and paste/rewording from something I posted in the past about this:

Its kind of like the perceivable audio spectrum.

I've always believed that CD audio was lacking something ("fullness" or "richness") when compared to full spectrum analog sound (e.g., vinyl). I, personally, have clearly heard the difference.

I believe the same concept applies here. Even though one can't see individual pixels above 300 to 400+ PPI, I have noticed a visual richness/fullness nonetheless.

So no, I am not "seeing [pixels] past 400ppi or..." anything like that, but I can tell.
You are also comparing two totally different screen technologies...
of course oled will look better even if it's the same ppi. Individual pixels can turn completely off. Not something LCD can do. What I imagine is you seeing that. Infinite blacks. Screens pop more because of that. Not the smaller pixels you can't see anyway(past a certain point)
 
Did you ever have the chance of looking at the 1080p oleds compared to another lcd set? Huge huge difference with the same resolution.
 
My eyesight is far from good at close iPhone viewing distances (without glasses) - old eyes. But I can clearly see the difference in sharpness between the iPhone 6, 6S, 7 screen resolutions of 326 ppi vs the 401 ppi resolution of the plus models. So called experts in visual acuity can tell me that the human retina can only discern a certain degree of resolution and anything beyond that is not perceptible... but the thing is - I can see the difference in the screens and you can too.

The iPhone Plus is the FIRST screen I've ever used that doesn't give me eye strain.
 
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You are also comparing two totally different screen technologies...
of course oled will look better even if it's the same ppi. Individual pixels can turn completely off. Not something LCD can do. What I imagine is you seeing that. Infinite blacks. Screens pop more because of that. Not the smaller pixels you can't see anyway(past a certain point)
@now i see it said what I was going to say. It isn't just between OLED and Apple's LCD. I see the difference between the PLUS and non - PLUS models, too.
 
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"Retina" is a term used to specify text that's sharp enough our eyes aren't able to discern individual pixels. For the 6, 6s, and 7, that distance is 10.5 inches. Add to that you only have a 4.7" display and you can see why 325 PPI isn't quite sufficient. The Plus is "Retina" at 8.6 inches away and it's a much bigger display so you don't have to hold it as close.
 
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