Look, we get it. You want it all – mouth-watering good looks, endless comfort, space for four, and world-cracking performance. We’re the same way. That’s why Mercedes started building models like the AMG CLS 63, a “four-door coupe” with enough chutzpah to roll up on top-dollar sports cars like it’s nothing. However, word has it Merc and AMG are cooking up a new take on that old recipe with something called the GT4, a high-powered sedan capable of challenging the likes of the Porsche Panamera GTS and Aston Martin Rapide S. We think it’s a swell idea, and even went to the trouble of putting together a rendering of what it’ll look like. Problem is, we did the same thing for the upcoming third-gen AMG CLS 63. That means it’s time for a showdown.