It had the 21's, but it still felt "smoother" over the bumps than my 19's with air. In the loaner, there was a solid "thump-thump" going over freeway imperfections whereas in my car, it's a much harsher "bang".
Interesting, given that you have 19s which would imply a softer ride. Maybe much of the improvement has been contributed by improvements in build quality and suspension tweaks?
Looking forward to getting my P85 in October for obvious reasons, but also to do a thorough comparison with my first early car.