There is a difference. All the videos I've seen with lvl 4s are the other team being terrible or the lvl 4 barely getting hit. Personally my HC with 242 att can 2-3 hit people with body shots when in reg crucible it takes 3-5 so in that regard I noticed a big difference. Another was arc blade doesn't always one hit. I've had to slash people twice on more then one occasion.