Do MBs have much stiffer gas pedals than any other cars?

I bought this 92 400E a month ago, still couldn't get used to its gas pedal, it's not sticky, just the spring is way too heavy, heavier than any other car I have owned, after driving it for an hour, I always get a sore right foot, this is the only thing that I am not satisfied with.

Is this normal?

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.