i think it's her youth that puts me off, to be perfectly honest. i think her voice is undeniably good, but i don't think she's got the control yet to be put in a league with christina. plus, i simply don't think her voice is nearly as good.
that being said, i have to agree that christina needs to hold a freakin' note every now and again. to use the AI word of the season, christina seems to be affected in that she's trying to imitate herself now.