I do get colour shifts with the lens, irrespective of the lens movements. I also take my calibration shot with a white plastic card. They eliminates the colour cast later on in phocus using the scene calibration tool. I also need to take note of the lens movements (including when there is no shift) and this is removed using the digital centre filter plugin in CS4 (not yet available in CS5. Grrrrr
I guess the extra 4mm available to me with the 28mm was important in my choice over the 32 HR. I already have the 35mm Schneider so the focal lengths are very similar. I shoot more and more panoramics and that extra 4mm with the huge movements on the 28mm just suit my style. On saying that I would have looked closer at the 32 HR if I hadn't already got the 35mm.
I have shot panoramics with huge movements on the lens. You have to do a bit of work at getting a final image you are happy with because of some noise caused by the light fall off (which must be removed digitally). This is more of an issue with the underexposed images (which are to be used for the sky of a landscape for example). I have shot panoramics with 19mm left and right with about 8mm vertical shift and I was happy with the end result. Considering it's a 28mm lens. That's pretty incredible. I would not be happy shooting with such movements on the 35mm.
If you look at the images I shot of Dublin Airport Terminal 2 all bar the 5th and 7th airport are stitched images using the 28mm. You just get this incredible range of options with the lens. I find the 23mm Rodestock focal length is a bit too wide angle for me personally (before some people say it is not I did say personally
) and the lens movements on the 23mm are less than the 28mm anyway.
I can easily say it's my favorite lens. It's not the perfect lens but it is pin sharp and has incredible movements. This for me is almost worth the pain in the ass caused by the digital centre filter
I hope that's of help to you.