Hi Tulpen,
The LS400 drive I feel is far more relaxed, smooth power delivery, gentle brakes....glides along on the magic carpet soaking up lumps and bumps. The LS460 didnt have this, the brakes were far to keen for me, even when trying to come to a gentle stop at slow speed, I felt like a nodding duck sat in the car, they'd bite slowly then suddenly grab. Also the magic carpet had gone in LS460, probably down to the larger wheels and low profile tyres but it felt no different than a BMW or Audi - Granted the LS460 is a far more modern car, inside the LS400 does feel dated by todays standard and the sat nav like an old Atari - but the ride and drive quality is by far the best I've ever driven. Even the LS430 to me which I had about 12 months (30,000 miles) had lost the LS400 "feel", hence I'd hoped to get this back in the 460 but I was so dissapointed.....so moved to Land Rovers !!! - I'd always been on the lookout for another 400, but wanted low miles / mint which are getting very rare now to find.....when this one came along I knew I must have it despite the price, I'm so glad I did, its exactly how I remember the 400 to be.
Probably though......'horses for courses'?
:-)