I've a 50mm F/1.2L. In the beginning I didn't trust the lense, because I didn't get the amount of keepers as I get from 14mm F/2,8; 24-70mm F/2,8& 70-200 F/2,8 IS.
When I began to analyse where it all went wrong, the main reason of the non-keepers was, that the pictures were to soft. I shoot at F/1.2. Now I use F/1.8 to F/2.0 and I'm quiet happy with the sharpness (blur) this lense gives me.
The second issue of this lense is the (auto)focusing speed. I need really good contrast for autofocusing to lock-on. The (auto)focusing issues is also compared to the above mentioned lenses. I don't know if that is fair or not, but for that kind of money I would expect more

I'm using EOS 400D and don't know if the (auto)focus would be better using 50mm F/1.2 on a 1D body.

Picture 1: 50mm @ F/2.0; 1/100; ISO 200[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.25.78.FashionShow/Nordatlantiske-Dage-_E100_-Bryggjuni_2D00_320.jpg[/img]





Picture 2: 50mm @ F/2.0; 1/50; ISO 200[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.25.78.FashionShow/Nordatlantiske-Dage-_E100_-Bryggjuni_2D00_291_2D00_292.jpg[/img]