Actually, Alicia comes across as someone who is motivated more by fame than craft, judging by her career choices between oscar-baity films and big budget thrillers. Great for her that she landed those roles, she must be doing something right, but I think it's disingenuous to claim she's all about 'the craft'. That comment about being at the oscars and wanting to be better known has always struck me as very candid and in bad taste. Mia Wasikowska is someone who is genuinely all about the craft. You never see her overexposed in the media, hanging onto Harvey or whatever it is young starlets unfortunately have to do to make it. The downside is she's not as famous as she could be. But she's struck out a very diverse international career and worked with great directors. She's made risky choices, some that didn't pay off, and some that did.
I actually think Alicia and JLaw are similar when it comes to acting chops. Very naturalistic, charismatic, but no complexity or depth. This can all be improved with experience and learning, but at the moment, I'd say both are overrated in the acting department. They're both fine, but not the amazing goddesses these PR spins will have us believe. JLaw does have the upper hand because 1. she's American and 2. very relatable. I personally find her a little grating, but she always seems genuine.
AV seems stiff and calculated. Having said that I don't think an actress' personality should be a factor in how we judge her acting (god knows Rooney Mara is aloof, but very talented).