And over what rpm range does the average 1.8T/2.8/R32 have it's max power?
If all your on about is the range where your getting absolute max power then it's going to be small on all engines. If a TDI engine is tuned well then you can spread the power out a lot better then you seem to want to believe.
My TDI pulls hard from 2000rpm right up to about 3800rpm and don't forget you haveto take into account the different gearing of a diesel to make use of the shorter rev range.
But in the end I don't think this thread being about Diesel v Petrol (like that's not been done to death a million times ZZZzzzzzzzz.........). It's about the advances being made for quite small amounts of money and effort in diesel tuning. I reckon if you doubled the power of your R32 you'd be pretty happy too?
Of course, i would have 500bhp that was fully usable through 4wd

Always makes me chuckle diesel owners going on about torque, when i have loads of torque and bhp through a much larger spread or rpm's (irrelevant of gearing) I dont see the point in them. Im allowed not to like them, its a rubbish fuel that has awful affects on people and is dirty, smelly and expensive!