I am driving a 2010 BMW 335d for my job, and suffice to say, I absolutely love the power. The only cars I feel that can beat it, in my experience, is E63 AMG and CL55 AMG (the one with supercharger). Even the regular BMW 335i felt lacking compared to the 335d.
I didn't like the sport suspension, the road noise and the seats, but then again, the 335d is supposed to be a sports car, and it reflects that.
I've had my 1998 E300TD for about 2 years, and I absolutely love the ride comfort, gas mileage, road noise, etc....
....but it does feel anemic compared to 335d. Even a stage 1 tune didn't help much.
I'm starting to get the itch to get a newer car, so I'd like to see if anyone in the LA region is willing to let me test drive their E320 CDI. If the E320 CDI even comes close to the sensation of performance of the 335d, I'm sold.
I just want to test drive it -- otherwise I'll just endlessly vacillicate on the "buy or not buy" for years.