2.7tdi is a 6cyl btw. Your dealer is a moron!! But then so is my Audi dealer.
BMW 5 series is an absolute belter, I would put my 535d as probably the only car you ever really need, it does comfort and sporty like no other.
However, I feel you made the right choice, cause if you want sporty buy something smaller.
Should have known not to trust a salesman. (Audi)
Re; something smaller, maybe next time, but at 6ft 2 & 16 stone and the ever louder tick tock of time, I don't want to have sporty and not be able to cope with it!