These threads kill me...
Both are incredibly good at cc'ing end game atm.
I have played a 20 WF archmage and a 20 Human Sorcerer at cap and in epics, I do like the sorcerer better.
I have CC'd every epic quest but 2 on my sorcerer (von5 and spies in the house) on a very regular basis, with dc 41 mass holds and 37-39 on most everything else I do not struggle to land my CC (Except perhaps the epic reavers and efreetis in adq1, but thats what irresitable dance is for amirite?). I also nuke very frequently in epics, and do a marvelous job of it. It's really all about the abbot clickies, with the amount of shrines in epics it makes me lol to see people saying you can't nuke.
Anyways, they are both incredibly viable in any endgame situation. To say sorcerers are gimp is really really ignorant however, they just require more gear to improve their dcs.
Just my 2cp.