I still think macosx has a higher degree of well-thought-out consistency. Just the ability to use readline/emacs keybindings throughout every textfield boosts productivity enormously. Yes, I'm sure you can enable this via kde/qt settings, but I'm fairly certain this conflicts with the PC-like keybindings, and there is no way to shift all qt/kde apps to use super as the primary command modifier throughout the entire environment.

That's just one detail, but it shows a consistent eye towards the user that feels missing from kde. It feels like they aimed for "floss version of windows usability" and stopped there.