No one does better tilt-shift lens reviews than Keith at Northlight Images. He has completed his exhaustive review of the Canon TS-E 90mm f/2.8L, a lens he thinks is the best performing tilt-shift lens that Canon has ever made.
From Northlight Images:
Without quantitative testing I can’t be sure, but the TS-E90mm F2.8L Macro is probably the sharpest lens I’ve ever tested (it could have been the TS-E135, but I’m not quibbling).
The build quality is superb, and putting it next to the old TS-E90 you really do get a feel for progress in lens construction. It is well up to its ‘L’ designation and red ring.
If I have a complaint, it’s the limited throw of the focus ring, which is simply too short for easy manual focus, especially at non-macro distances.
Optically, I couldn’t fault the new lens, it’s performance at f/2.8 is exceptional, with only vignetting to really take note of. Read the full review