Ok, i'd like to correct myself, i wasn't able to find any other S vs. 7 test on AMuS site but this, where S class (S350 here) looses again.

Vergleichstest: Vergleichstest Audi A8, BMW 730i und Mercedes S 3 - auto motor und sport

May be i confused it with other magazine, or it was v12 versions?.. I was absolutely sure that i read it in AMuS...

It seems like AMuS mostly prefers BMW for some reason.