The next closest car is the Ferrari 599XX which was the first production based car to break the 7 min mark. It ran a 6:58.16 about a week before the Pagani set it's record. The XX is only slightly less of a street car than the R. The main difference is the R can be licensed for street use somewhere, the XX cannot.
https://www.youtube.com/watch?v=FJj8atDGBzk