Full Disclosure: I've always been a Gnome guy. But not really because I ever liked Gnome more than KDE - I've always used Red Hat based Linux distros, and Gnome just feels more like home in a Red Hat world, which is entirely intentional on Red Hat's part. Nothing wrong with that. It's just the way it is ...
Moving on - I've been using Fedora Core 1 at home as much as I could lately. And for the most part, it's been a good experience (but not great). On the positive side, the startup process is the slickest, most user friendly one that I've seen on any Linux distro (yeah, it's a small thing, but it's the small things like that which come togehter to make a really good user experience). Gnome 2.4 comes packaged with FC1. It's a pretty good desktop environment. But it still has a lot of rough edges. Things like sound events and window animations kind of work, but not always very smoothly. There are a lot of places in Gnome where you get the gist of the way things should work or look, but don't quite (for whatever reason). It feels unfinished.
From stage left, enter in KDE 3.2. Noticed it was released a few weeks ago and there have been quite a few reviews floating about mentioning various improvements. Screenshots looked nice, so I thought I'd give it a whirl. Download RPMs. rpm -Uvh --force *.rpm (some conflict with a Gnome theme kept popping up until I forced it). Log out. Select KDE. Log in ... and holy shmoly moly. They've been busy.
It's the little things that stand out in 3.2 - KDE Wallet (similar to the Mac OS keychain), Kopete - the slick IM app (where did that name come from?!?), and the ability to access an SFTP account directly from the file manager. But all these things come together to give you a really impressive Linux GUI right out of the box - which is really what's most important in an OS for an end user. It doesn't make much difference what an OS is capable of if it's not easily available out of the box. The more things like this come together, the more Linux becomes a real threat to Windows.
Sidenote: Fedora News is a great little site, even before Slashdot discovered it.