I'm sure there are better diesels out there, but I'm certainly very impressed.
I was a passenger in an Audi A6 with a 2.5 V6 TDI a week before I got my IS220D, and hearing that grumble, groan and strain away - with little change in speed - was really putting me off the idea of having plumped for the diesel.
However, I find the refinement of the 220D to be fantastic. Yes, the soundtrack is never going to compare to a petrol but most of the time I find it to be silent, or near enough. I only have 400 miles on the clock, but can already fairly comfortably use 6th gear at 70 mph (and certainly at 75-80 it's very happy...surely I'm not the only one who is happy travelling a fraction over the speed limit on the motorway?? And as Jamboo's post on the speedo accuracy shows, an indicated 75 is more than likely perfectly legal!).
Anyway, I digress - as for fuel economy I'm averaging high 40s, generally exceeding the offical economy figures and managed 60.5 mpg on a short run out along 40mph hilly country roads the other day.
The engine in the 220D also exceeds not only the Euro IV but the proposed Euro V standards on Nox and particulate emissions - by a long way for the particulate. I don't know what other diesels can manage, but that sounds pretty advanced to me.
And one final point:
295 lb/ft of torque mmmmmmmm