As far as sharpness I would say that some Sonnars are very sharp.
Yes, you can get a lot of sharpness, especially if you stop down (like most lenses). Here's one stopped down to f/8 or f/11. If you zoom in on Flickr, you can make out the price on the sign for the stack of chairs in this photo.
The 180mm F2.8 CZJ Sonnar is one of the principal reasons people go into the Kiev 60/Pentacon Six/Arax/Exakta 66 system. I sold off my P6/Kiev stuff, but I really miss this lens. So I bought a cheap Zebra version, and hacked it to my Plaubel Makiflex 6x9 cameras. Time for a beer