(Sorry to dig up old stuff, but this is interesting)
But Sarevok has stats to die for.
Ok, they can both get STR 19-23 depending on which belt you give them, but Keldorn's very low DEX is a significant con. Sure, gauntles of Dex takes it up to Sarevok, but then Sarevok can don the Gauntles of Extroadinary specialization.
Sarevok can have Wong Fei Ioun stone aswell, which is great, and indeed Keldorn can get Carsomyr, but I beleive Sarevok with Gram sword of Grief and Death bringer assault more than makes up for Carsomyr's uberness.
Plus, Sarevok is much more specialized with 2H sword.
So basically, Sarevok can kick Keldorn's ass in tankness and fighting (Even if Keldorn summons deva['s]), and with the amount of wands of spell striking you pick up Watcher's Keep, Keldorn's dispel magic is equalled.
But I can't think of anything that counters Keldorn's True Sight...
"It is not a Commonwealth division, it is an Australian Division. Why, give me two Australian Divisions and I will conquer the world for you!" - The Desert Fox