I think there are rock stars within every subgenre, and for people who are obsessed with musical theater Sutton Foster and Audra MacDonald are like Beyonce to them. I'm sure the a cappella world has their own version of that, and that exists in every geeky subculture.
You, and you alone, are the person who should take the measure of your own success. . . . I do not try to be better than anyone else. I only try to be better than myself.