As far as Street Fighter gamers get, they don't come much bigger than Daigo Umehara. He endorses fight sticks and has his own t-shirts. And here, he's profiled on Japanese TV.
This is a best-of collection, with Daigo footage you've probably seen before. There's also a page from a Famitsu article from 1998 with a young Umehara.
In the opening section, Daigo said he used to practise every day -- save for New Year's (December 31 and January 1), because he had to presumably spend the holidays with his family. All the other days, he was practicing Street Fighter.
Pro Gamer Life [YouTube]