Sufficient to follow Nate Grahams excellent reports:
https://pointieststick.com/
It's interesting that quite a lot of the work in KDE now seems to be feature enhancements and rectifying what I consider quirks rather than serious bugs. I am really happy with KDE/Plasma 5.14 and it is by far my preferred DE.
By contrast I have MX Linux installed and have been following its development for some time and there are some serious annoying behaviours which I consider bugs, most of which are probably due to the state of Xfce DE rather than MX itself. Thunar is terrible compared to Dolphin, Konsole is way better than XFTerminal, and Kate/Kwrite are best of breed. Other DEs I haven't checked out for a while although I'm most interested in LXQt.
I saw a lot of KF5 libs being upgraded in D-U this week, Plasma may soon follow.