Hmm, I'm gonna say EVE Online.
If you're thinking competitive you shouldn't be looking at MMORPGs, rather games like:
- Dota 2
- League of Legends
- Starcraft 2
- Street Fighter
- Quake Live
And there are plenty of competitive MMO's out there. There are tons of games with PvP in them, and it doesn't get any more competitive than PvP. I don't see how someone can classify PvE as competitive when you're literally not competing against another person.
Ever Quest 2: 80 Shadow Knight, 63 Warden, and other lowbie alts.
Guild Wars 2: (Ehmry Bay) 62 Ranger (and counting)
Diablo 3: 60/13 Demon Hunter & 60/15 Witch Doctor
Rift: 50 and counting...
Currently Playing: Rift (PvP server)
league of legends....