To me the one that'll count most would be the Sport Auto Supertest (mentioned earlier by CanAutM3), they test both on the Nordschleife as well as Hockenheim GP, so it kind of covers all bases performance wise. I would expect the G80/81 to do well on the Nordschleife (since they've been running it here for two years already) but not so well on Hockenheim where it won't be able to hide its excessive weight...a smaller and less powerful M5 basically.
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