Powerlifters will definately bench press more because weightlifters don't bench.
When comparing the squat - powerlifters perform a low bar squat and hence you cannot compare it to the high bar squat the weightlifters do. I think weightlifters have much more powerful legs though - when you compare across the same lifts.
Weightlifters dont specialize in the deadlift however it is a part of their training and I think weightlifters will out deadlift powerlifters if they focus on it.
