Well yes, however KDE in RHEL 6 is a disgrace. While KDE has improved notably over the years, RHEL 6 is stuck with KDE 4.3 which has lots of issues (eg. the kate editor crashing frequently, etc).
Red Hat could have included the considerably better KDE 4.4 at the time of finalising RHEL 6, and it is puzzling that they didn't. If I recall correctly, KDE 4.3 shipped in July 2009, while KDE 4.4 shipped in Feburary 2010. RHEL 6 was released in November 2010.
While I don't disagree that a decent amount of spit'n'polish is required to bring open-source software up to enterprise standards, I disagree that this should take around 15+ months (ie. the gap between KDE 4.3 and RHEL 6 release dates). Viable explanations for this are that Red Hat doesn't really care about KDE, and/or that Red Hat didn't fully trust KDE developers to minimize possible regressions between KDE 4.3 and 4.4 (which would be a puzzling attitude in itself, given that the point of new minor releases is to improve things).
I'm hoping that Red Hat will not make similar mistakes with Gnome 3.6 / 3.8 when it comes to composing RHEL 7. With the amount of Red Hat employees working on Gnome, there should be more trust that things are not going to break between releases.
To be clear, I'm not advocating the constant update of Gnome components in RHEL. Instead, I'm advocating that the choice of Gnome components in RHEL 7 should be based on UI usability and ease of discovery from the point of view of people used to "preceding" desktop paradigms (ie. most people).
The jump between Gnome 2 and 3 is massive in terms of how the interface has changed. As such, Gnome extensions (that allow the desktop to behave in a more traditional manner, ie. classic mode) are absolutely essential.