Any chance of posting some pixel peeping comparisons versus Canon glass?
I find the 14mm L, 20mm, 24mm T&S, and 24-105mm IS L okay for A3 prints from a D5 or 1Ds Mk II, but no better than okay. I'd be in no hurry to trade up to a new 22mp Canon uber kamera without better wide-angle optical options. So real world experiences of other lenses via an adapter would be very interesting.
Incidentally, I once tried Hasselblad lenses on a Contax 645 using a Contax manufactured adapter. The results were a bit disapointing, even with great Zeiss/Hassie lenses like the 100mm and 180mm. Shots often looked soft in one corner but not in the opposite corner, which might suggest the adapter had thrown the lens off axis. Maybe it was a one-off dud, but it left me a little cautious that lens benefits might be thrown away with an adapter.
Anyhow, I hope your adapter works ou,t and your practical experiences would be much appreciated.