Talking point ignoring:
Different countries can have different populations with markedly different health characteristics. That is, "race" in the sense of genetics; in the US, not just African-Americans but plenty of mestizos with a lot of Amerindian genes. Not that I know anything particular about what the latter brings to the table, just that it's sure to be different ... and, heck, the former is a unique population, right?, and neither are in large numbers in any parts of the 1st or formerly 2nd Worlds.
Different countries use different methods, e.g. to my knowledge no other country in the world tries to save premature etc. babies as much as we do, and scores failures to do so as deaths. Neonate deaths are a very major factor in overall life expectancy calculations, since so much potential lifetime is lost.
Those who are interested in bourgeois truth look at things like life expectancy after being diagnosed with X type of cancer. And even then you have to adjust for different populations.
And you compare us to Japan, as genetically homogeneous as you're going to find after they disconnected from the rest of the world and most kept that in modern times??? Please....
Plus plenty of those systems you refer to have free market characteristics, which you weasel with by saying "100% taxation sponsored" ... which I'm not sure really includes any of them but Canada, and they have the obvious fudge---part of their official system, too---of crossing the border. (By that I mean they're the only ones I know of to outlaw private healthcare.)