Had the LS460 a few days now. Here are some thoughts on it vs my outgoing LS400 (Mk3):
Wind noise. Certainly less, but then my 400 was 15 years old.
Road noise - probably a tiny bit worse than the 400, or maybe not. Hard to say.
Getting more used to gearbox and its double-downchange on kickdown. The kickdown in the 400 was definitely faster, but new car accelerates so strongly once it has decided which ratio to choose that I can forgive its current foible. I understand the transmission may adapt to my driving style - we shall see.
Brakes seem good enough, as does the steering. That I haven't thought about them must mean they are performing just fine - as good as a 400.
Ride. Would be hard to improve on a 400, but it is definitely a bit better.
Stereo noticeably better, even though I thought the 400's was pretty good.
One thing I do not like... On the old car, when manoeuvring in a tight space one could leave the throttle alone and let the car creep on tickover, controlling the 'speed' with the brake pedal. On the new car, if one takes foot off the gas whilst parking, it stops moving and pressing the throttle when you only wanna go forwards a wee bit can be a bit unnerving as the car does a bit of a surge and I have visions of bashing into something.
All in all I think it is quite an improvement.
Are you nuts? No, you cannot be as you drive a Lexus!