Let's face it; most of your garden-variety Mercury imitators don't resemble the guy that well, or don't sound much like him. Sacha Baron Cohen both is British, so the speaking voice is halfway there, and would bear a passing resemblance if he grew the Borat mustache again, kept it trim, and threw on the Ali G tan. As for vocals, I don't think there would be ever any question that no one can top Freddie; the only question is how they choose to dub him. There is enough material on Freddie live and studio that I think they should be able to replicate concerts nicely without doing the whole "let's stick the studio version over an audience and call it a day" trick. If they dub live shows with live shows, I'm satisfied.