Earlier quoted context omitted.
> I mean, does anyone actually notice the difference? Absolutely.
Really? Your eye can resolve the difference between 300 ppi and 500 ppi at arm's length? Also, don't be a stranger.
On the Nexus 5 (440 dpi), I can't see them anymore.
Resolutions above this seem unnecessary to me -- but for the N6, 1080p would mean 360 dpi, so that might be sub-perfect. 1440p will be perfect for sure.