I feel that OpenSUSE has had the best KDE default settings and Kubuntu had the worst defaults.
Re:Ten Years of Kubuntu
by TallGuyShort on Friday March 20, 2015 @10:12AM
(#9237798)
Mageia - forked from Mandriva - is still actively developed, I believe - but I haven't tried out KDE on it. I think my Fedora 20 install looked pretty slick out of the box, but I don't think very highly of my own taste :)
Today I guess OpenSUSE is the closest thing to what you describe.