As Waititi's Civil War short films proved, Chris Hemsworth has been hiding some wonderfully honed comedy chops under that Asgardian beard secretly. He was already leaning into a comedic role in his Avengers appearances (mostly because of the culture clash element of his story) and he's taken fully off the leash here to brilliant effect.
His timing - from the very first scene - is precise and can be devastatingly effective, and he's obviously benefited massively from working with Waititi. It's not an entirely frivolous comedy performance either, though, as Thor goes on a well-defined evolutionary arc - similar to a war-time rebel leader, basically - as we finally get an answer to what it means to be worthy. And none of the laughs distract from that.
To be fair, it feels a little unfair to single him out - Mark Ruffalo is brilliant too, Tom Hiddleston is his usual self (with a little more fun thrown in), Cate Blanchett is an irresistible marvel and Taika Waititi is a scene-stealer. And of course, Jeff Goldblum is on great form, as you'd expect.