My favorite comparison is Motor Trend where they have the Merc, Audi, and BMW on a track. About 2/3 through the track the M3 is so far ahead there is a notation that says something like: "The M3 is making a farce out of this race." For combination of hadling, comfort, and speed I think a tuned 335 is the main competition.
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2015 f80 M3, 2016 GT3
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