I considered getting the 335i. My purchase is for personal use, so was weighing it up, albeit briefly.
But it's true you look at the figures on paper and performance wise there's hardly anything in it.
I was advised only to get the diesel if you do the miles or if the diesel is cheaper to buy than the petrol.
After joining this forum, people saying the pickup/torque on the 30d day to day is a lot more noticeable/effortless. My mind was made up.
I plan to do a few road trips when I get my 330d. I think if I had the petrol, it would 'grate' on me too having to plan ahead for fuel stops.
Watching the fuel gauge waving goodbye to a full tank of petrol