In this video, Kengo Kuma's tuning is the best. The 24K piano has a terrible metallic sound from the strings and doesn't deserve its price.
I've been maintaining my Yamaha C3X myself for the past two and a half months, and it's been getting much better. It'd probably surpass the Flying Fazioli here.
It might be interesting to have a competition not based on the price of the pianos, but between tuners and people who do their own tuning as a DIY project.
