Competition? This would only work in a game where all parties involved took the EXACT same group makeup with the EXACT same skill trees in order to see who the best players are. How about we just say good job and continue on?
Wait, what? So that means, by your definition, that all competitive raiding guilds in WoW don't count (even though they're paid/sponsored), because they don't run the exact same make-up.
Player skill determines if something is cleared first or not, of course you need the 2 tanks, 4 healers, etc... but the specifics of those roles don't determine a groups success unless the players are skilled.