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it has lots of chromatic aberration and is a bit soft at the edges when shifting. there is a red mark at about 7mm on the shift scale to indicate after this point it all gets a bit crap.
the 45mm is sharper but has a bit of c/a when shifted but nothing a bit of the rubber stamp in hue or colour mode doesn't sort or failing that i process in the canon software and use the c/a tools but i prefer the images out of capture one.
the 90mm is stunning and one of the sharpest lenses they make. i process the raws with no sharpening at all instead of the usual 25% for all my other lenses. it focuses very close and for still life is perfect using the tilt to get focus
this is a canon article on their tilt/shift lenses, they use one of my images of a wristwatch shot on the 90, i couldn't have achieved the same depth of field on the 100mm macro.
http://cpn.canon-europe.com/content/technical/tilt_and_shift_lenses.do
i would get a 24mm but on 21mpixel it starts to show it's shortcomings and i find a stitched 40mm shot gives me the same angle of view as 21mm on 35mm full frame which is wide enough for me 99% of the time.