The Mangelsdorff and his Friends album features 6 duets with 6 different players: Don Cherry, Elvin Jones, Karl Berger (vib), Attila Zoller, Lee Konitz and Wolfgang Dauner. Indeed a very interesting album, but be prepared for some outward playing. Most of this is mid tempo stuff without a clear song structure but full of melodies developing and degrading.
Live in Tokyo features the quintet sans Kronberg. It has been a while since I spun the LP, I'll need to dig it out. I remember it as a pretty loose affair, at least when compared with Now Jazz Ramwong and (One) Tension. Of course it being live explains a lot in that respect, but there is also a departure towards freeer structures from the group dynamics that characterises NJR and (O)T. This live album is still song oriented with themes and players taking turns soloing though. Sauer is one of those intense screetchy players with very distinct tone and phrasing. Lenz is simply amazing.
If you get a chance, check out Now Jazz Ramwong by the quintet, an absolute classic.