I regret to report that London, after decades being the butt (Har!) of jokes about public-toilet quality, has definitely surpassed the USA. Here's the Russell Square Scarily Advanced High Tech Automatic Toilet. It cost 20p (Har!). When you put your money in, the door on the right opens Star-Trek-style, and you go in there, and when you're done all kinds of automatic flushing and handwashing and drying and generally cleansing things automatically occur. It is the size of a small apartment.
I availed myself and was deeply impressed. Here I am at the Control Panel.
(Photos by Miss Sophie Barry)