I have an S5 Sportback and while I haven't driven the M340i, my previous car was an F30 340i.
Pros for S5: Great suspension, pretty good handling with the sport differential, good looks, nice interior
Cons: Terribly laggy throttle in Drive mode, and even in Sport mode the ZF-8 is just not as well programmed as the BMW
Bottom line is I have not been able to get comfortable with my S5 after 10 months or so. Looking to trade it in and get into a G20, most likely a 330i.
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