Yeah, Mishima would be ok, and so would Soseki, Kawabata or Oe, but they are the very few I can think of, and they are all rather contemporary (post-Meiji). It's only natural that modern Japan, which wants to excel in every field, should have a few good writers, but compared to the average in Europe or the US, they are still very few. Japan is not a literary country. That was my point. Language is't that important in Japan. Food, entertainment or business certainly are more. It's part of its cultural specialization. Every culture has its strength and weaknesses.