I don't have a video of the 'Ring, but I have the following videos of Tsukuba, one from Forza and one from GT4. Granted, you won't be able to get a feel for the physics, but you can still compare the graphics style:
http://www.technogeeky.com/ForzaTsukuba.avi
http://www.technogeeky.com/GT4Tsukuba.wmv