The first German sedan that I drove at speed was an '89 735i (e32, I believe). What a pleasant high-speed driver. It was showroom fresh and drove up to 100MPH on the Interstate with silence, security and ease. Since then, I've driven V8 e32's and successors, including the current 745Li. All were consummate high-speed cruisers, very comfortable.
Of course, the examples I drove were all new or near-new, so I can't vouch for their ability to gracefully age. But what a ride...