The thing with Vettel is that I'm not sure we ever see him fully on the edge. The fact he can usually pull out a fastest lap on the final lap of a race without trying too hard is slightly worrying. Obviously the car helps but he seems to (unfortunately) have an incredible natural speed and knowledge of how hard he can push 'safely' while still blitzing everyone.
I'd love to see another proper race like the Merc won that Senna one back in 1984. Fairly 'normal' cars, all identical, over a reasonable race distance (none of this 2 lap ROC stuff). Invite some of the yanks over from the US series so the F1 boys can piss all over them and see what happens.