I can't believe you'd take a Citroen, and more so, the C6, over this Volvo! But, each to his own
I would take the American spec Honda Accord over the C6. Or even a Nissan Maxima.. but that's O/T, so I'll let it go..
As for a performance S80, they might as well do it. It shouldn't take them a lot to develop it, since they're probably not so concerned with honing the chassis and dynamics so much as making sure it's powerful and refined enough. Dynamics will probably only need to be satisfactory, IMO. There are always some of the Volvo faithful who are wealthy enough to want a bit more.