The only merit to this comparison is that seemingly for once a video is not being made right after a torrential downpour. The GT-R is a different type of vehicle that was aimed at the 911 turbo. If you feel this comparison makes sense, then comparing the M5 to a 911 turbo makes sense as well.
The British simply do poor comparisons and this is beyond sub-par. If BMW will send us an M5 and Nissan will send us a GT-R we'll show these people at Autocar how enthusiasts really compare these cars by doing a 1/4 mile comparison from a stop giving the M5 proper rubber and putting it on a strip using launch control on both vehicles. Additionally, how about some dyno numbers? How about some roll on comparisons? If you are going to make this comparison, at least do it in a manner that will not hamper the M5.
Autocar chooses the GT-R. You know what we choose? To stop taking British automotive reviews seriously.