I saw two within a few minutes last night, Etihad A380 going left hand off 27L as well as the Thai B77W a few minutes later, both of which went around from short finals and both landed afterwards. It's worthy of some comment on these boards, I didn't learn about how safe all of this was by osmosis....
It's hard to be unimpressed at an A380 on a missed approach, it's also impressively quiet.