Had the most sublime soba ever at Juugo in Kyoto. Small shop right off the Philosopher's Path. Literally farm-to-table, every serving made to order by chef-owner Ishhibashi-san who harvests his own buckwheat on his farm. Amazing what magic he conjures with just buckwheat and water. Try his sobagaki as well.
Nice, we were in Kyoto a few weeks ago and also went to Teuchisoba Kanei. Excellent soba.