Azarenka seems to enjoy the fight involved in winning--at least that's her on-court attitude, and as I noted during her great AO 2013 run, she's very hungry for majors, while trying to separate herself from the rest of the so-named "Generation Suck."
On the other hand, Sharapova would love to add a couple of majors, but serious competition, age, her body type & outside interests may combine to prevent her from earning more than 5 when all is said and done.
I think it is clear that outside of Serena and Azarenka, Sharapova disrespects much of the field, and feels she has a stronger shot at the majors than the likes of headcase/sloppy Kvitova, headcase Lisicki, angry Bartoli, weapons-challenged Radwanska & Wozniacki, overrated Stephens or any of the aging set (Venus, Stosur, Li Na, Schiavone, et al).
Unless Victoria becomes disinterested or suffered a major injury which permanently alters her game, there's not much to stop her at the majors...other than a completely healthy Serena.