The car looks quicker to me. The motorcyclists seem to have cut the video a couple of times when the road is clear and the car is going off in the distance.
But, it's a quick car, and these are only 600cc bikes, albeit fast 600cc bikes. I doubt the bikes can do much over 250kph whereas the car can probably do well over 300kph and more?
I reckon Captain American with his pimped out kwakawaka could get close to the Mercs top speed (but probably not close enough; actually, I reckon my missus in the Honda City would outrun FS...).