As someone who does Cg for a living, I feel kind of dumb for not realizing the robot was a man in a suit.
Actually I didn't think about it while watching the movie. Maybe there was a moment when I just assumed it was CG because almost every VFX of this nature isn't done practically anymore. I love practical effects and it's good to see some filmmakers not turning to Cg for everything.
Couldn't embed the video for some reason....
https://www.youtube.com/watch?v=PBpBXf8GIp8