Just got it last night, and snowed pretty heavy today, so haven't done much but try and learn how to use it. Did get up on the roof after dusk, and tried a shift panorama, just to see how wide it gets with out moving the camera.
Our backyard with just a bit cropped off the top and bottom, full left + right shift, stitched in CS4.
Second image is the uncropped, unedited version, so you can see the amount of vignette and full coverage.
WB was the most unusual I've experienced, 11,000, -19, in Lightroom for what you see below. If I used the eyedropper on the snow, LR set WB to 20,000, -22. Crazy or what? The lens? No filter, it was dark, ISO 100, f/8, 2.5 seconds.