The official competition world record for a raw deadlift (a deadlift performed without the aid of a deadlift suit and straps, where only a weight belt is allowed) is 1015 lbs (461.4 kg) by Benedikt Magnusson. This lift currently exceeds the equipped record of 457.5 kg (1,009 lb) by Andy Bolton.
Further proof that you can't cheat a deadlift. It's you against a dead weight that you lift from the ground to waist height. There is no momentum here! That's the reason why we call it the Deadlift. One of the Ultimate Test of Strength.