If you put enough sail on a brick ( TI displacement hull) you can even get that to go. With my spinnaker and jib flying I have 265 sq ft of sail on my TI. I have been been 18 to19 mph and held it for quite a distance on several occasion now. Very wet ride though, as sometimes the bow is completely submerged.
I used to sail sunfish when younger, would go over quite often, have not tipped my TI in way over 2000 miles of sailing sometimes in pretty bad condition.
This is just my opinion but I feel the TI is much more versatile.
I'll admit, I threw out a hook there and you took the bait. I agree the TI is a more versatile platform, but that wasn't exactly the question. The TI is fast, no question. But as a displacement hull it has a top end. Past that no matter how hard it blows or how much sail, all it will do is dig a bigger hole. My H17 is the same, so is my Wave. Extremely efficient displacement hulls. The H17 will do about 22-25 but then no more. However a Sunfish will plane and if the sailor is good enough to keep it under him the top end is theoretically much higher. In that vid I bet the Laser hits close to 18-20 on a few of those waves. If the wave was taller and steeper it would have been faster still. Another area where the Sunfish will do great is deep down wind. You can sail a Sunfish very fast almost dead down, where a TI would like to be heated up a little. Over the course of a run in high wind the Sunfish will likely win. I have seen Impulse 21's beat 1-14's on a run despite being over 600 lbs. heavier and going slower. But here VMG was better. I did the CT River race 2 years ago in a Sunfish and while there were no TI's there was an H17 and 14. For the first 6 miles it was light and shifty. The Lasers and I were horizon jobbing the cats, till the river opened and the wind hit 12-15. Then the cats gained back and took over. However the lead laser finished within 20 minutes of the H17, on a 12 mile windward course.