From a performance stand point, the boats are amazingly similar! The real difference is the nut on the tiller. At around 12 knots, maybe ten, the sloops begin to pull away. The greatest separation seems to come at the windward mark as the sloops get their spinnakers set faster. From my vantage point on the beach this was really obvious.

One thing that doesn't show in the results is that each of the top three boats was able to pull at least one horizon job on the rest of the fleet. Another, Matt & Gina on the Falcon did an amazing thing on Sunday. They were fully four minutes late to the start (after beach repair) and still pulled off a fifth place finish. You had to see it to believe it.
The real story is consistency; Robbie and JW are machine like in their precision. They just don't make any noticable errors.