The reason they are so quick is actually they have a VERY peppy rear axle and move at pretty quickly from stop lights in the city, because of the gearing.

Which means, naturally, at much higher highway speeds they will run out of breath quicker than the long legged cruisers like the US spec 300SEL variants that have "lazier" or "economy" rear ends.

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)