GNOME 3, Activites, and KDE 4

There have been a slew of new articles detailing the progress of work on GNOME 3, and the refrain in all of them has been that "GNOME 3 will revolutionize the desktop". The focus on GNOME 3, ever since the release of the first mock-ups, has been on the new GNOME Shell and GNOME Activities (which are really just two sides of the same coin). The thing is, GNOME Activities has essentially the same concept (and even the same name) as KDE 4 Activities. So I was thinking for quite a while: how can this be called "revolutionary" with a straight face? Today it hit me: while KDE may have had the idea first, GNOME presents a far superior execution of this idea; GNOME Activities in the alpha and beta versions of GNOME 3 was very usable and improved with each iteration, while KDE Activities remained very slow, very buggy, and nearly unusable until the release of KDE 4.5.