Best case he is just as "humble" as CR. Worst case, even less so. Messi is a case study in someone who if they have something perpetuated in the media enough about them people will start to believe it no matter how untrue.
Go see Messi's "humble" reaction to Kaka trying to say hello and whatnot after the Argentina v. Brazil game recently. Dude is as big a tool on the pitch as Ronaldo.