Interestingly enough, I love the handling of the MY AWD w/19's. I routinely do 270 turns when getting on the freeway and the MY handles it perfectly. I test drove an Mercedes E model many, many years ago, and it was certainly plush but with oodles of body roll. I find the MY somewhat comparable to a 2018 BMW 330 GT in terms of handling (albeit based on a very limited comparison driving a friend's car)
It can certainly be harsh on some washboard roads that need to be repaved, but that is the exception rather than the rule in Southern California. Otherwise, it seems fine with the exception of speed bumps. Even at ridiculously slow speeds, below 10mph, its jarring.