I expected this lens to be really good.
It performs better than I expected!
Sometimes I have to double check the EXIF, to convince myself that I am looking at a photo taken with a super wide-angle lens. The shift function does wonders, and the ability to rotate the shifting mechanism is very useful.
I have made some large prints, and the details I can discern does not stop to amaze me.
The build quality is stellar. Believe me, I have dropped the lens (sigh).
My advice: only remove the cap to take a shot and replace it soon after.
This is my favorite, out of many L lenses I own.