(that's from a master class taught by the great dressage rider v. Neindorff)
That's the traditional size that you'll still see in the Spanische Hofreitschule in Vienna, but I've noticed in this country bigger and bigger "Lipizzaners", probably the result of outcrosses to warmbloods. Since international dressage judges prefer the large warmblood type with the long stride to the little muscular traditional type, probably Vienna is the only place you're going to see the old type in another 20 years.