KDE on Wayland has been making a lot of progress recently to the point that it's becoming usable and with KDE Plasma 5.5 it looks like it will be in very good shape.

I was tipped off today about the "rapid progress" being made in making KDE day-to-day usable under Wayland and is starting to get up to par with KDE on X11.

Here's the recent Google+ postings showing off the latest KDE Wayland progress by Marco Martin and Martin Gräßlin:

Popups and blur effects

Window positioning

... And fine-tuning that positioning to be perfect

Proper window stacking between XWayland, Wayland clients, and Plasma Desktop

Descriptive compositor names

Martin has also put the KWayland library in the Inqlude Qt library archive for developers