I have not played the top C & C courses in the US so I can't really comment on the rankings, but I did just return from Tasmania. Lost Farm is a great course. Given the proximity to the water, I just have to believe that it is the best site Bill Coore ever worked with. It is the site he did not get at Bandon. So my guess that people who have played all the C & C courses will put LF at the top.
Two cool things I learned out there:
1) When Mike Keiser became involved in the project, he put Bill Coore and his wife on a plane to see the site (never sent the bill to his partner) and I guess the rest is history.
2) I heard this from an employee of LF: after several days of walking through the dunes and marrum grass, Bill Coore mentioned that he had not seen any tiger snakes. A local said: "you usually don't see them, but you will hear them, they make a barking sound." Bill Coore went white...