Not all of them have had opportunities to act, so its really an unfair question.
Edit: To be fair I will answer to the best of my ability
1.Yoona- Its not a coincidence that she has the most pagganap jobs, now to be honest. I don't like her pagganap too much because it doesn't seem challenging, but people say she has matured as a actor.
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link 2.Sooyoung- Again not a tagahanga of her pagganap but it isn't bad, really its not bad. I think her pagganap could be a good niche for her since she is getting notice for it. I hope she gets a nomination or something.
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link 3.Yuri- Despite the obvious cringe worthy pagganap it was better than others. She shows potential and promise.
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link 4.Sunny-I don't know if she is counted as an actress because she also had to sing and act but even still her skills got her nominated for a rookie award. Some critics sinabi she shows promise in acting.
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link everyone is not really seen in a positive light when it comes to pagganap or they haven't acted in a while