Historically, the e36 M3 sedan was stiffer than the coupe. The sedan was slightly harsher and handled slightly better in stock form due to more rigid rear chassis and reinforcements from the extra set of doors.
If that's any indication, then the F80 M3 may feel stiffer than the coupe.
People often wrongly assume that coupes offer better performance than sedans. And this couldn't be further from the truth when talking about BMW's.
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