nah, I'd say it goes something like this
Akuma
Ken
Ryu
Dudley
Urien
Yang
Alex
Makoto
Hugo
and you see everyone else pretty rarely. even Hugo and Makoto are kind of rare, Alex and everyone higher than him make up a lot of the online ranked players. there are a LOT of shotos in ranked. in custom matches there's more character variety, but also the players are a lot better. if you're already good at the game that's where you actually want to be playing, ranked matches are more casual and generally have worse players.
you don't see much Chun and Yun in ranked. no one plays Yun because Genei Jin actually requires execution and most people can't do it, and I dunno why no one plays Chun. I can say that the Chuns I've played online haven't been very good. she's a great character but the few people who do play her online aren't awesome with her.
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http://www.youtube.com/watch?v=npHDxSvwCE0