I think you are comparing apples to bananas. 535i M-sport on 19" is stiffer, but does it mean it's worse? Is 911 GT3 also worse than a loaner 328i because the ride quality is poor on potholes? It's not a fair comparison.
5 series has a much more refined suspension. 3 series doesn't even come close. Wheel size and tires do make a big difference though.
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