Yes. There are other big disparities too. Compare countries you might consider similar.
However, all of them show much the same trend: IPv6 doubling every year. (Which is a bit of a slowdown, until recently it was doubling every ten months.)
At this point I think we might see the first pure-6 service or site soon. I expected that to be either a private warez site or game server. Do any HNers know about one already?
