At last, I'm on Solus - Plasma 6. As a long time Gnome and Budgie user there's some new stuff to learn. It has though soem quarks still, but nothing serious.
The way KDE uses icons are a bit different than other DE's, so if I have to migrate my icon packages to KDE it will take a huge amount of time and learning.
But overall a pleasent experience, especially how Plasma works now and it doesn't feel so heavy as Gnome at the same time.
By the way, I haven't figured out on how to remove the upper left icon(s) in the windows decoration, it seems that feature is missing.