Okay lets compared a HSV to a 350Z (the flagship of the Nissan sports car range right now)
Price
HSV Clubsport R8 - $63,000
Nissan 350Z - $63,000
0-400
Nissan 350Z - 14.37s
HSV Clubsport R8 - 14.01s
No track times but I'm sure the R8 would be faster.
Of course the new GTR will be faster than any HSV or Holden but its a totally different range of car.