Alfa Romeo Giulia Quadrifoglio Verde just beat F80 BMW M3 and everything else with 4-doors that has ever lapped TopGear test track.
This comes as another confirmation that Giulia is, at very least, a worthy rival for BMW M3, if not indeed world's fastest 4-door saloon car.
I personally think that fastest 4-door is second generation Porsche Panamera Turbo, but Nürburgring lap times suggest otherwise.