KDE5/Plasma 5/QT 5 does not respect hinting settings

[MrZammler]

Hi!

I'm test driving plasma 5 and while it seems pretty ok, I've stumbled on a problem I can't fix. No matter what the setting in Font->Use anti-aliasing->Hinting style is, KDE seems to stay at hinting slight/none, while I want it to be full. QT4/GTK2/GTK3 all have correct hinting (full).

I've seen a few reports on this on the web, but can't really tell if it's broken or meant to work ok. Anyone with the same problem? I'm on plasma 5.4.2 with respective dependencies.

Thanks!