Cover half of his face and you can see the subtle differences between the two. Now that's awesome acting. << Yes, cover Tom's face and look just at Loki. Now cover Loki's face and look at Tom! Woah, I always thought the two didn't look alike.
"I present to you the world's most adorable gif. In which Chris Evans gets scared by Tom Hiddleston and Tom Hiddleston gets scared by Chris Evans." ♥ <---- I see the "left boob grab" by the adorable Chris Evans!