Which albums?
Do you have any Shoji Aketagawa? He's free, but not at all in the way that Yamashita is. As much as I like Yamashita, who I think is amazing, it's Aketagawa who I spin the most. But...they're two very different vibes.
And since this is a Japanese Jazz thread, and since Yamashita has been mentioned, I just want to put this one out there as perhaps one of the earliest (1969) examples of the "free" Japanese scene. Strongly recommended:
Akira Sakata is not on this one. Instead it's Yamashita's first horn player: Seiichi Nakamura. He holds his own, though perhaps not at the level of mastery that Sakata brings to the table. I didn't know that Light In The Attic reissued this one. (I have the Japanese reissue.) Sound is crunchy, but the vibe is amazing, especially given the circumstances the album was recorded under. The protest call that begins the album, even though I don't understand any of it, sets the mood perfectly.
This album is on a level with Spiritual Unity and Machine Gun. That important, I'd say.