I remember Dario Benuzzi (Ferrari chief test driver)saying that since the 355, they work on the car to be easy to drive and predictable for all drivers, the F cars are not optimised for track days (except Challenge & CS cars).

If you want to compare something, compare the track times of the cars in the fia gt championship.

Anyway i don't think ferrari cares about the nurburgring times, i don't even know if they try their cars on this track, i never heard of it.