Top speed rarely means anything useful, only in a handful of tracks like Monza or the old Hockenheim it plays out to be a noticeable advantage. In F1 most importantly you need a car that sticks to the ground and corners well, since those are the places where time is lost and gained most. It's clearly evident that Red Bull is the fastest car right now. IMO Alonso, Hamilton and Kimi are all quicker than Vettel. Vettel's still a damn good driver though, but perhaps more than any other sport the competitors equipment plays as big a part as the competitor himself in F1.