Yep, diesels are sharp!
Eg. Audi Q7 6.0L V12 TDI with 500HP / 1000Nm, 0-100km/h in 5.5sec, v max = 250km/h (limited)!
Now imagine this engine in A8.
Or ...
MB E420 CDI 4.0L V8 with 314HP / 730Nm, 0-100km/h in 6.1sec, v max = 250km/h max (limited)!
Or ...
BMW 535d 3.0L I6 variable-twin-turbo with 272HP / 760Nm (soon 286HP, 780Nm), 0-100km/h in 6.5sec, v max = 250km/h (limited!)
Or ...
BMW 335d 3.0L I6 VTT with 286HP / 780Nm, 0-100 km/h in 6.2sec (coupe in 6.1sec), v max = 250km/h limited.
Or ...
etc