So I can shed some light at least in regards to the F30. In my opinion there is a huge difference between sport auto and steptronic. Even outside of cosmetics, and paddles. I've driven enough f30 loaners with steptronic to know there is noticeable difference in shift speed between the two. The sport auto shifts stronger and with more authority. With that said, assuming the shift speed is roughly 100-200 milliseconds of difference, is that really a game changer? Depends. Drive both to see how you feel. For me it was.
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