It would be more helpful if posters identify their specific model; my take is there is a noticeable difference between SWB, LWB, and the Touring Package. I am very apprehensive at the moment re reliability; I had a rather simple electrical problem which seemed to baffle service personnel. The Parking Assist accessory borders on fraud by Lexus as it relates to the owner; it is complicated, flakey, and poorly supported with useful instructional material. All 460L models I have seen have this option, and when even my dealership couldn't get it to work reliably, they advised "just don't use it."
Suspension, brakes, parking brake w/hill holder, quietness, navigation display. These are all superior to the 430 series IMO.
Either furnish better instructions or refund the cost of Parking Assist; it is a dumb idea that is poorly understood/supported by dealer personnel. Media hype re fit and finish is overdone; the car is very nice, but not that much better than earlier LS 4XX models