As far as high end stuff goes, a lot of it is MUCH cheaper (Accuphase, Harmonix, Zanden, etc). Also, a lot of the "big" companies (eg. Denon) make really great high end gear that they don't sell here in the US (we only get the cheapo stuff).
As far as music/CDs go, I don't think there's a specific rule, although there are many Japanese remasters of some CDs that I think are unbeatable (eg. Kind of Blue, remastered in May 2000 by Sony International)...