I must admit if I was asked to choose between a C63 or an RS4 I'd always pick C63 purely because of its engine, looks and the sound. RS4 both B8/8.5 and B9 are just too bland imho. They lack character and I don't find them appealing, at all! I still prefer a B7 RS4 over B8 & B9. And I know I might already have annoyed a few forum members here by saying what I have just said
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Between an E63 and RS6, well there is no comparison in my eyes. An RS6 all day long.
If you are considering the 0-60 being the only criteria then RS4/5 will beat a C63 all day.
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