Not production cars, but here are some reference lap times that Top gear just mentioned.
Mclaren 720s GT3X: 1:07.2
Ferrari FXXK: 1:08.1
Pagani Zonda R: 1:08.5
Aston DBR9: 1:08.6
Ferrari FXX: 1:10.7
However, the FXXK and GT3X are faster thanks to the added tarmac run off areas for the last 3 corners. In fact, the whole board of modern cars all benefit from the added tarmac.
also bear in mind that the FXXK and GT3X get a good headstart by having better launch systems off of a standing start.