In many ways it feels very similar going from an LS to a GS. It's still a big car. The road noise I would say is similar, many of the toys are the same, I still have a rear blind but not vibrating seats (which I never got to use). The build quality feels better, the doors close with a wonderful sound! Cabin noise is very low, fuel consumption is much better and it's only about half a second slower to 60. The ride is great, roundabouts no longer feel like a boat on water with much less body roll. The interior would compete with anything made today. It's a real pleasure to drive. Saying all that, I love the LS and will always have a soft spot for it! The one I've bought has been impeccably maintained which must help with the overall feel. Seats are still very comfortable.
Music system isn't ML but still excellent.