This season everyone was on their A-game, but if I had to pick a standout, I'd have to go with Stephen Root. He really brought it, especially in the later half of the season. Watching Barry go John Wick on everyone's asses was just brutal. I actually think I felt more watching this finale than I did for Game of Thrones, not to take anything away from that.
I don't say this often for TV shows, but this is a season I'll definitely want to go back and rewatch soon.