Thanks for the advice - I'll see if my 17-40L will work on the 1Ds. Hadn't thought of that...I thought you could only use Zeiss glass on the 1-series Canons. (Come to think of it - you live in the land of Zeiss. Let me know if you see a Contax RTS mount Zeiss 21mm in your local Aldi-mart.)
Good luck with the 10-20. I think we'll all be interested to hear how it performs. Perhaps some brick wall photos? I haven't been posting around here much lately, and I'm sure wetpixel has been the poorer for the lack of wall photography. If there's no suitable walls, 10mm should be sweet for humpbacks or whalesharks (both present in NW Oz at the moment if you're passing through).
P.S. Got an interesting phone call this morning from a wetpixeller re: that other wonder of German photographic engineering, the EWA-marine plastic bag. Seems the 1DsMk2 (!) doesn't allow proper function of a macro lens due to insufficient clearance between camera and the optical port up front. If my Queensland colleague's reading this, she may wish to post her problem online as I have full faith in Jolly and James' ability to engineer a solution. 