Personally, watching the online feed, basically everyone wore Vaporfly or Alphafly this year. I saw one single runner wearing what looked like maybe the New Balance 5280, and one runner wearing Adidas's new shoes. Aside from those two, everyone whose shoes I could identify were *fly Next%s.
According to a couple of Japanese sites (links below), over 95% of the 210 runners wore Nike. Just 4 in Adidas, 3 in Mizuno, and 2 in New Balance.
https://media.alpen-group.jp/media/detail/running_210103_01.html