Passenger & boot space
How it copes with people and clutter
The Mercedes-AMG E63 has a slightly snugger-feeling interior than the Audi RS6 Avant and BMW M5, which is more to do with the higher window line and thicker pillars than it being any smaller inside. The reality is you get very nearly the same front head and leg room as you would get in the RS6, and it's wide enough that you can make use of the front armrest without worrying about connecting an elbow with your passenger.
There's also slightly more rear leg room than in its two main rivals. It's worth noting that the E63 estate has a bit more head room than the saloon, but even the latter is fine unless you're very tall. Sitting three burly adults abreast will be a bit of a squeeze, but a trio of younger teenagers should be comfortable. The Porsche Panamera has five seats, too, but its middle rear seat is nothing more than a perch suitable for occasional use.
