just check the 0-60 or 0-100 times on GTi v GTD or any petrol v diesel like for like. Tells you all you need to know really. Yes, in gear accel of sporty diesels is impressive but the short rev range drives me mad.. What i love about petrol turbo is the best of both, real low end grunt that gradually gives way to top end power.
Would anyone buy a GTD for ONLY the way it drives, if fuel cost / economy was of no consideration ? Unlikely I think, mainly because most cars are going down the route of lower capacity turbo engine v 6 cyl larger ones a few years ago, which brings the benefit of flat torque curve from low revs (think the GTi develops max torque at 1500 to 4000 rpm or so) so the once true argument that a turbo D gives in gear flexibility that petrol doesn't .. is no longer really true..
Put you foot down in 4th in the Gti (or any decent turbo petrol) at 1500 revs and its all the acceleration you need.