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I would really hope someone could chime in on this...I have a UL and wonder if the sport rear sway would make a difference as opposed to my "sport" suspension setting.
Full discosure: I don't own a UL. However, I recall another CL forum member who had a UL and added the sport sway bar. He said it did make a difference in body roll going into turns, as well as at highway speeds from sway due to wind, passing a truck, etc. That would make sense since the air bags on the UL are for mostly ride comfort, even with the "sport" mode, since the sway bar is designed specifically for body roll and pitch. There are existing threads you can search (use google search: "sport sway bar Club Lexus") and perhaps you can find the threads about sport sway bar on a UL. If you can DIY install it, it's a very inexpensive mod that everyone I know who has installed it is has been happy with it.
I have the sport sway bar on my '06 CL and it absolutely does make a difference. I'm adding it to my '05 CL soon.