Yoshiharu Habu is one of the best shogi players so far.

This sentence is not wrong grammatically, but maybe does not mean what you think it means.

The "so far" in the line "one of the best players so far" means that up until this point in time he is one of the best players. But the strong implication is that you think in the future he might not be one of the best. If that is what you mean, then that is fine.

However, the more common sentence would be: "Yoshiharu Habu is one of the best shogi players in the world."

I'll try to translate one of his sayings I like.

It is extremely hard to continue something with constant passion, willpower, and motivation, and I believe it is exactlyso that is what I believe is talent."