Bryce Dallas Howard
I've seen her in films before (50/50, Jurassic World, Spider-Man 3) but two of those roles she was more supporting and whilst she impressed in JW I found the film not that great.
However she has impressed me so much in this film. The range she showed and the chemistry that she had with Joaquin Phoenix was mesmerising.
I did adore this film, but her performance was for sure the highlight (along with the beautiful cinematography)