Thanks Xmas. As far as sharpness wide open, this photo shows the capability of this lens. This photo also shows what an entertaining dinner partner I can be.
Anyway, the 50/2 is plenty sharp for me and it has that certain (insert French expression for "I don't know what.")
If I ever get the f1.5, I'll get my tripod and some CMS 20 film and do some testing; but so far I see no reason to get the 1.5.
I agree with you about ballyhoo! Ballyhoo seems the great creator of demand. There's probably a lesson in there for us!
Would love to see some of your images from the CZ 50 F2 if you care to share? Is yours the CZJ or the later version?