munro harrap: I use a 1Ds MkII. I cannot get good lenses for it. I have returned a 17-40mm, a 100-400mmL, and a 70-200mmL recently, and have tried out four 24-70mmL-none of which is as good as my old 24-85mmUSM, and have tried out 3 24-105mmL, lenses and bought 2 which were returned, as like the tryouts, they were soft and quite hopeless at the longer lengths across the frame.
So I fully understand the current problems Canon users have, none of which a new body addresses. The lenses are poor.
I am saving for a new machine, but why bother? as without the optics to match there is little point. Dealers box them so badly they get damaged (must be deliberate- you cannot do that by accident) .
Some lenses may be OK, but this new machine needs lenses that cover 35mm not the EF ones designed for cinema HD 2 Megapixel formats, and everyone is waiting for those. At the moment, its a con.
i'm not sure why that is the case for you. But I have used loads of L lens with 5d, 5d2 and also 1ds2 just like yourself and quite frankly the lens are spot on sharpness. In saying that though, my 1ds2 tends to misfocus every now and then, compare to 5d and 5d2 focus 100% accurately. Maybe you should get your 1ds2 calibrated ? Just a suggestion