How does lexus sport suspension compare?
Depends which one. The IS and GS F-Sport are reasonably competitive with the F30 and F10 3 and 5 series, but that's mainly because the BMWs have gotten so soft. The RC-F continues to be a step back from the M4 knife edge though. Its suspension is at least properly sorted unlike the first gen IS-F, and some people may actually prefer it purely as a road car. At least Lexus doesn't have to pump in fake engine noises through the speakers. I'd still take the C-class over everything else though, I don't like the IS/RC interior design at all.
DaveBSC, the XC90 is also the most important car (compared to RX for Lexus) in Volvo's lineup as the rest of the cars for the next coming years will be based on it. They need to make it great.