The same happens for American fruit & Japan. It was weird wandering around Japanese marketplaces and seeing Product of Oregon and Product of California signs on produce that were vastly superior to what I was able to buy in the US.
One thing that weirded me out about Japanese supermarkets is that the Australian beef I've found is totally inferior to any of the Australian beef I've seen in Australia. I wonder if preferences are different?
Japanese beef is a strange case. Because there is so little land, produce tends to be high quality, but very expensive. Australian beef is imported specifically to fill the "cheap beef" market, so sending the good stuff would defeat the purpose.