Summary: Very sharp, my new go to lens for Food and Product Photography. Will take some learning since this is a manual focus lens but is a sure winner and will change the way you frame your shots with its tilt and shift functions.
Conclusion: I actually borrowed this lens from Canon a year ago for testing and just happened to have a small assignment shooting a large antique tractor truck for a calendar while I had the lens. I was absolutely blown away by the image quality then and knew that I would have to own this lens at some point. And while I'm still shooting architecture most of the time, I don't anticipate using it much for that except for the possible detail shot of wrought iron, woodwork, etc.
Pros: Superior build quality, Super-sharp images, easy to use, useful for macro photography, light weight & relatively small
Summary: An absolutely awesome lens. Definitely worth the buy. Great for portraits, macro, architecture, flowers, etc... But don't take my word for it. Read the reviews online. Lots of good things being said about this lens. This is a great lens.
Summary: If Canon were to make a macro version of this lens, they could easily charge $3,000 for it. When I view my Canon 5D Mark II files at 100% the clarity and definition is spectacular. I've shot just about every Canon lens. This one is the best optically. The only hitch is some CA wide-open.
Summary: Here's a few pics I've taken with it: http://automotomedia.net/showthread.php/82-Canon-90mm-TS-E-fun-for-taking-shots-of-cars-motorcycles! Rented a 45 and didn't like the image quality. This lense was considerably better and tack sharp when not tilted/shifted.
Summary: If you look for a tacky sharp short tele-lens with total depth of field control, the Canon 90mm f2.8 T/S is the ultimate answer. With this lens you can transit easily from landscapes to portraits to macro shoots. Adding a 12 or 16mm extension tube you go thru 1:1 macros with an amazing depth of field.