Put it to you this way. I have driven my friend's M-sport 2011 535i several times and on a couple of trips up to the Philly area. Compared to my 335i its not as responsive, doesn't handle as well nor do you feel as involved driving it. Don't get me wrong I am not one of those that says the new 5-series is a dud, I love that car. Its just that as a drivers car the 335i is better and in terms of room inside the cabin I would say it would be a non-issue for you at over 6 feet tall. I am exactly 6 feet 225 lbs (not fat either, I work out regularly) and have no issues at all with the interior or the sport seats.
2015 335i Sportline | Driver assist| HK | NAV | Premium | Heated Front seats |8-Speed Auto.
2014 X3 35i Dynamic Handling Package| Cold Weather Package | NAV | Premium hi-fi system | Driver Assistance Package.
2013 335i Sportline | M-adaptive | HK | NAV | PDC | Heated Front seats |6-speed MT. GONE Great car, zero issues
2011 X5 35d Great SUV gone