I'd favor Alvarez but a Sturm W would be no upset by any means. I'm not sure Alvarez would be able to pull counter Sturm's jab, which is still one of if not the best in the business.
Not as weak as Darren Barker or Geale apparently. Canelo goes the Distance with blown up shot lightweights and loses to welters. Sturm KO's MW. Ginger has no chance.
Felix would beat Cotto. Cotto lost to Trout who is a lot like Sturm in many ways, except Sturm is taller longer reach hits much harder, better chin. Sturm beat Hoya who is like Cotto in some ways (lefty fighting orthodox), but less active then Hoya. Floyd we wont ever know, then again some say Floyd ducked Margarito, Paul Williams and wont man up for PacMan. Floyd aint no Joe Armstrong or Sugar Ray Robinson or many others with bigger balls then his.