well I got my first lot of prints back a short time ago, using my 3 L lens, 16-35, 24-70 and 70-200 IS and also using a polarizer while taking some snaps of my car in the sunset.

Every picture was exposed perfectly!! I was sooo happy after coming back from digital!!! I was freakin out about having horribly under/over exposed pictures as I find the meter on my 20D to be REALLY in accurate...

and unlike with digital, wide is reeeeaaaally wide
and unlike my 20D, every shot was pin sharp :o

only problem I had was some dark shading in the corners at full wide and when using the polarizer...

But yeah, I'm loving the EOS3