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Are you on run flats? If so, replace with go flats asap. I went with Michelin PS4S which many on this forum seem to have chosen as well.
With 20" rims and PS4S tires I would say that my ride quality is fair. I tend to drive most of the time in sport suspension. I don't know what the E60 M5 rides like, but I can say that my E90 328xi rode like shit with run flats, and rode better with go flats but still harsher than my F06 M6.
Also are you positive no modifications were made to the car you bought? I bought mine and it had a modified exhaust. I purchased from an independent dealer who didn't even realize that it had been modified.
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