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Introducing the all-new Mercedes-AMG GT 4-door 63 S! Mat’s got his hands on this epic all-new performance hybrid, and he’s on hand to not only see if it’s better than its predecessor, but to see whether it’s better than his current long-termer – the BMW M5 CS!

On the face of it, you’d probably think that not much has changed compared to the previous generation… And you’d be right! On the outside, bar a few badge changes and an updated bumper, it largely looks the same. It’s a pretty similar story on the inside too, bar a couple of infotainment and button tweaks here and there. But then again, that’s no bad thing – it’s still a glorious bit of kit!

However, the biggest change is one you can’t see – under the skin! With a 4-litre…