Very good question. They are quite similar and both are excellent heads. But the Kayuga steel is a bit harder and thus didn't get nicked up at all in the steel plate. I also prefer the straight edges of the Kayuga, and the bleeder system and the more stout tip; it's not going to roll over.
Appreciate your info and feedback, I looked at some European websites to try and get info on the value of this particular Steyr. Further input from you on it's value would be appreciated as you have a bunch of them. I assume you collect the Steyr Luxus for a reason ---they are a finely built rifle.