The difference will be stamina. Lara faded against Paul in the late rounds but he was able to make it at least competitive since Paul is so flawed. Nobody at 154 has the talent to stop Sergio at this point. If Floyd moves up, maybe. Lara should get the winner or loser of Cotto-Marg or Canelo. If not I wouldn't mind a rematch with Molina or maybe Vanes.
I now what the arguement would be but there is something about Martinez that he can't get the " W" and the only knock out that worth a darn Williams. I like to see Martinez fight lara, he is very skilled.
Martinez late KO. I need to see Lara fight more styles for me to be convinced he belongs in the same class as Martinez.