BMW M5, Mercedes-AMG E63 S, Porsche Panamera head-to-head - video

Everyone loves a good drag race, especially when there are three big sedans – okay, two sedans and one 'four-door coupe' – involved. Over in the UK, Autocar has sent the BMW M5, Mercedes-AMG E63 S and Porsche Panamera Turbo S E-Hybrid into battle, to find out which ultra-exec is quickest off the line.