I have never driven any European car. All other cars I have driven were GM, Ford, Chrysler, or Japan Based Toyota and Honda. This is also my first Nissan.
I do agree that it is a pretty firm but comfortable ride though.
I'm impressed with the structural integrity of the 2012 Sedan. It's absolutely solid, without any squeaks or rattles, and the ride is quite nice. Can't compare to any euro car as I've never owned one, but I can say most Nissans are quite good for integrity (this is our 8th)