As a lens with a Leica mount, as opposed to a custom built Leica lens? I think the Angenieux lenses I was talking about were distributed by Leitz, hence Leitz's input on quality. But I know that Angenieux also fitted Nikon mounts; I think for the zooms they made and especially the short zoom. As far as I know, the 'top' Angenieux lenses (the 200 f2.8 ED and the DEM 180 f2.3 APO) were only fitted with the Leica mount, but I could be wrong. Van Hasbroek's Leica history says that the 45-90 f2.8 Angenieux was distributed by Leitz. I have the impression that Pierre Angenieux went in with Nikon after he broke up with Leitz.
My SIGMA lens was also available in other mounts.