I believe I shot that with 64 Ektachrome with a Mamiya 645. There is no noticeable grain, even at the 'poster size' of the print. It looks like just another photo in the digital image of it posted here .... in real life it is spectacular. In 1983 they sold 'photo passes' for $100. It gave access to all sorts of areas right along the barriers and full access to the pit lane. I've got some incredible photos from that weekend.
Hasselblad is a lot like Leica. I think one of the reasons for owning either is sheer appreciation of the equipment itself. Do either really take better photos than other top equipment? I doubt it. I once owned a Russian Kiev 6x6 (looked similar to the Pentax 6x7 SLR). This thing was a poorly made piece of junk to be honest. But it was priced accordingly. That said, I took some really nice images with it!
For the money, I think it's really tough to beat Mamiya in medium format. If I were buying MF, I'd go with the Mamiya 7 - it would be like a point and shoot instamatic for you, coming from 4x5!!
