http://www.angryroleplayer.com/diablo-3-builds/barbarian-builds/immortal-kings-whirlwind-gr95/
Back in the day we used to spin with IK set as well. It was never the meta, but a viable alternative. With the buffed IK set, Skull Grasp, and buffed Bul-Kathos's weapons it is much more viable than before. Still 3-4 GRs behind classic Wrath of the Wastes, but not that far away!
You can clear GR95 with around p1000-1500 and even 100+ with high paragon (2000-2500+). If you don't have your Wastes set, IK provides a viable alternative and is very fast at speedfarming and low level gemups. You don't need CDR as well!