Well... he's not painted but here is the berserk knight, from the knights of legend set. I put him next to Khârn *looks around to make sure he's not coming for him* and one of my WE zerkers (on a Micro Arts base *insert shameless advertisement*) to show the size comparison. He's a little thinner than the other two but about the same size.
Yeah, we flew our space church across 500 light years to get to this planet taken over by the space orks. Now we're going to drop from orbit in buckets and run out and shoot pistols and hit people in the head with chainsaws. Yeaaaah Ultramarines!