Geography alone makes Fukushima less bad for human health.

Beyond the immediate vicinity, most of Fukushima's contamination is going into the Pacific. We have very good data on how diluted that radiation is once it gets to places people actually live, and the answer is "extremely diluted". The prevailing weather all moves to the east, directly out to sea.

Whereas Chernobyl spread its contamination across a populated continent.

If you had to pick a place in the world to release radioactive contamination, you couldn't do much better than the Pacific ocean. Which is exactly why nuclear weapons testing was done in places like Bikini Atoll.