Back to the G90 for a moment, if I may...
I did the comparo of the last gen G90 against the current gen Lexus LS last year and came away liking the Lexus interior for its higher quality and greater luxury, but preferred the 'old school' V8 in the Genesis from a driver's standpoint. I was worried that the new G90, having now gone to a V6 as well, would have lost some of its panache the way the LS has, but this new, albeit wildly complex, drivetrain is excellent. The new G90 is a much more engaging car to drive than the current gen Lexus LS and the luxury and finishes are now on par with the Lexus.
Will the G90 hold up over time as well as an LS? Only time will tell, but I wouldn't bet on it. But for someone looking to keep it for a few years before trading it on the next big baller sedan, it should serve just fine. And I'll come out and say it, the on-road feel of this thing, especially cruising down the highway feels like any modern S-Class I've driven. The same solidity and refinement here. This is a genuinely exceptional machine. Just don't spec yours with those annoying power door closers. Uggh.
North America isn't the only market for these, too. In Korea these must sell 10x the German competitors combined -- at least that was my observation there.