Not really. It sort of side-steps the issue by having extremely configurable icon, font, window, etc. sizes, but it has no real, OSX-style high-DPI support like GNOME does.
More configurable, but certainly not better. It's a major pain to set up, since everything (fonts, titlebars, desktop panels, icons in various contexts, scrollbars, cursors, GTK equivalents to the above) has to be set independently, and many things still aren't capable of automatically scaling at all, like checkboxes, anything using KWebView (like konqueror or khelpcenter) or Aurora themes. Some parts of (say) Amarok's interfaces completely glitch out when scaled past a certain point.
For this particular subject, my money's definitely on the "just works" solution.
That sounds plainly better. Being pixel agnostic by allowing everything to scale as the user pleases will allow a broader range of users to configure their system as they prefer it. (Last I checked, OSX on retina devices couldn't even use the actual resolution of the screen without third party extensions... A problem I don't have in Linux with a high-dpi screen).
