OK..... to put it another way.... screens are getting to the point where, like processing power, we're not going to GAIN much.
Look, if something took 5 seconds to load and now takes 3, you notice. Same goes for screens. There was clear difference when I bounced from my S3 to a Nexus 5. But the difference between my G3 and that same Nexus 5 is often more subtle.... less noticeable when looking at, say, the homescreen but shows up when looking at text (I don't see the sharpening issues by the way) or if you load up one of those 1440p videos. So even though the G3 screen has a clear technical advantage over the N5's, the perceived difference isn't as big.
We've kind of passed the point where someone is going to be blown away by something new.... especially if you are coming from one of the current flagships... S5, M8, Nexus 5, etc... it's just the nature of the technology..... The same thing happened to laptops not too long ago.. processors got so bloody fast and RAM so cheap that even a cheapo laptop could run everything quickly and as long as you weren't playing Crysis at some obscene resolution, it was all pretty much the same. I think we've crested that wave with mobile phones now as well.... no one component is going to wow the world.... phones will have to impress with the sum of its parts.