Who is the Greatest MC Alive?

So Kendrick Lamar has kicked up a lot of dust with his verse in J Cole's 'Control.' In fact, hip hop hasn't been buzzin' like this since Nas' murdered it. True, Kendrick is a new cat, but not many young MC's gunning for the throne have/had the cojones to call out established acts the way he did. Perhaps Kendrick may not be the greatest alive, but he's solidly staked his claim to be the next greatest in the foreseeable future. For now we've got to ask; who's your greatest MC today?