I didnt know that was common. All I know is that when I whistle for him I can see him running to me from blocks away, so I know his hearing is good. Usually when the groomers ask me what kind of cat he is I just tell them the big-cute-fluffy-white kind. I guess I'll stick to that.
I just did a search on google images for Turkish Angora. He does actually look very similar to a lot of the pics it came up with, but he's definately mixed with something else.