I've had this lens since it was first released, and ultra rare. (Rodenstock/Alpa had issues centering it, apparently)
Alpa SB mount, not XT-mount.
It's a stupendous lens when used to its full coverage ability - shifted for 4-way stitching on an Alpa Max for example.
IMHO, it set a new high-bar for MF digital stitching when it was released. Not been keeping up with things since.
Still got mine here.
That said, it's really not the best lens for the XT, as you're wasting that amazing field coverage, and lugging around a lot of big heavy glass. If you want a 90mm for travel/ hiking, I'd go for the Schneider 90/4.5, which was a great leans - far, far lighter, and just as sharp for the central, non-shifted area. I owned both, and the blue ring 90mm Roddie, (3x90mm!) which sadly is not in the same ballpark as either if these options.