A great year in screen acting boils down to this
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Oscar Isaac, "Inside Llewyn Davis"
This is an unranked list, but if it were numbered, it's safe to say Oscar Isaac's performance in the Coen brothers' "Inside Llewyn Davis" would be at the top of the list. The year's stand-out unaffected work in a year permeating with such portraits, it convinces like no other. You don't see an actor at work, you see a character at play, and that's before the musical performance elements are addressed. This was the most lived-in portrayal of the year.