JNAT Nagura -- Tenjyou vs Mejiro (vs Koma)
For me, Koma definitely makes a difference. I understand that the main reason for skipping the Koma has to do with its popularity with sword polishers, leading to its relative scarcity and subsequent high price. When I need to touch up a razor, I bring it to shaving sharp using Komo on my pre-finisher, and then refine it on my finisher first with soft kiita tomo slurry and then hard asagi tomo slurry followed by pure water. Progress is monitored by feel, the sound, and by watching the behavior of the slurry/water.
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