New site we just launched at SRK. Takes into account Top 8, 16 or 32 placings depending on the size and skill level of the tournament. All results are based purely on tournament placings and not by a a popularity contest: http://rank.shoryuken.com/
You can also filter by character type to see all the Akuma players, but currently doesn’t address if it’s a player’s “main” or “alternate” character yet. We’re working on that feature for the next version so that the character sort list can hopefully be a bit more accurate. For the time being though, most here in this forum can recognize who mains Akuma and who doesn’t.
Here’s my mediocre tourney results: Currently #68 in the rank list: http://rank.shoryuken.com/rankings/player/byname/kineda.