I must admit, the S is an epic car. I did nearly 500 miles in it at the weekend and it covered them perfectly, effortlessly in silence and comfort. The difference with my S though is you don't get in it to drive for the sake of driving. This feels quite different, it's as comfortable, it's as quiet but it's something you'd get in to go for a drive for the sake of it. Plus it's a pretty car. It's as pretty as the S Class is practical.
It's very nice, like a sportier, lower version of my S. I've not had a chance to take a proper drive in it but it's very lovely so far. Looking forward to revving up the V8 properly!
FWIW I find the 5.5 much torquier lower down than the 5.0. It's much more diesel-like in that regard. But you also get a top end which obvs you don't get from compression ignition.
I assume it'll feel sedate compared to a 63, of course. You're about 150bhp down.....