https://www.google.com/search?q=japan+wins+best+pizza
Yes there is also bad pizza in Japan but, for example, there are around 90 "certified" neapolitan pizza restaurants in Tokyo.
https://www.pizzanapoletana.org/en/
Whether or not you believe the certification means anything, the point is there's lots of good pizza.
There's also lots of bad too ...
In France croissants are available everywhere but you have a very high range coming from high artisan standards to very low industrial products with very basic places in the middle mostly heating stuff rather than doing the whole process.
In Japan i guess there's less available bakeries specialized in things like croissants and they sell it as a high quality product. There's also highly qualified bakers from France that are working in foreign countries.
Too much possibles biases to really judge.
[0] Maison Landemaine 03-5797-7387 https://goo.gl/maps/KsWoBvWk6dcyUfkq8