9 out of 10 points and recommendedSharp, Contrast82mm
If you can find a good copy of this lens I can recommand this lens. But I have tested 3 others lenses on a 1Ds2 which were not better then the Mark1reviewed October 28th, 2007
1 out of 10 points and not recommendedF1.2, construction qualityPrice, very bad performance
I was also very disappointed with the purchase of this lens. I tried 4 copies on 1Ds2 and with the best one I went to the Canon service. They made the lens a lot better but the lens still shows more CA then any other lens I have.reviewed October 28th, 2007 (purchased for $1,800)
Buy it only if you really need to shoot wide open at F1.2. It is pretty sharp wide open but mine 24-70mm F2.8 is wide open at F2.8 sharper then the best 50mm F1.2 I could find (and after a visit in the Canon service) at F5.6 and with less CA.
After testing 5 copies and 2 visits at the Canon Service I can only say that this lens is a joke!