Haha... one of my dedicated hobby too. I have the Hattori KD
A big fan of Takeda, Shegifusa, Itou and Watanabe. I have quite a number of their knives i.e. Gyuto, yanagiba, Mikimono, Ajikiri, Deba, Banko Bunka,etc.
I also collect some Western knives, eg Catchside (his 63,000 layers damascus sujihiki). I like Murray Carter knives too. Of course my dream one day is a custom made knife by Kramer.
I am also a fan Japanese Natural sharpening stones, Nakayama, Ozuku, Ohira, Naguras, etc etc.
This is one of my hobby since the 90s.
I was very active in knife forum last time.
Nice to share the same hobby with tea hobbyist here.