There was a sexdaily for cure found, I was told.

I'm a KDE zealot (ditched Ubuntu when Unity became the default UI), and Qt tends to handle most of the issues, especially if you use a theme like breeze-gtk or oxygen-gtk to force GTK to use Qt's settings. I'll bet most of your issues are GTK forcing Qt to play by it's rules.

Other than that, you're encouraged to install the infinality patches to make fonts gorgeous.

https://wiki.gentoo.org/wiki/Fontconfig#Anti-aliasing.2C_hin...