No. Not really.

There is a range of crank sizes that will work for someone. I prefer just making a straight percentage calculation in a range from x 0.19 which is short to 0.216 which is quite long. If you want to ride in an aero position then shorter is better. You would have to be a freak to be able to get a good aero position with x 0.216 cranks yet apparently it works for some.