The Oxford panorama was made by stitching 9 images together, which explains the resolution. It seems that the Union Square panorama was done with a 10.5mm lens, which I think is around 180° diagonally, so that must be multiple stitched shots as well.
These really put my attempts at QTVR panoramas to shame. I guess it's just not possible to get high resolution panoramas out of a single shot: you need multiple images' worth of pixels to get the resolution up.
But resolution aside, I still can't figure out how to get shots with this Kaidan lens that have enough depth of field to actually be in focus. It's very frustrating, especially since I can't even really tell whether it's in focus by looking in the camera: I don't know whether it worked until I get home and run the processing software.
I'm not sure if I'm doing something wrong, or if it's just junk.