Have had our ES350 Tech Pack for a couple days now and totaly agree with your assement concerning the ride, while I can't compare it to any previous Lexus, since this is our first, I can compare to a 2011 Avalon, which I understand was very similar, while the quietness is still there, the ride is much firmer, Incidently ours has the Michelins and am not really noticing any road noise,same with regards to panaramic roof, although it is still early, just the same, we love the car so far, although the tech package can almost border on the intimidating, obviously quit a learning curve with this car!!
Vador