I think what I am going to do is rent lenses from Adorama, starting with the 35mmL and the 24mmL. I don't think they are renting any of the Zeiss lenses yet, but given the recommendations here, I at least need to know for myself how these lenses shoot before I totally discount them.
Buying Leica lenses was sort of like Nascar - buy a Summicron and turn it to the right.
But Canon AF lenses often seem to have sample irregularities. The first 17-40mm lens I got had to be returned because the left 1/4 of the image degraded the closer the focus got to infinity. Thus the Zeiss recommendation.
In the Zeiss, the consensus seems to be (from a night's worth of reading Fred Miranda) people really like the Makro-Planars (100mm and 50mm) and the 21mm f2.8 Distagon. The other lenses have pluses and minuses, but all of them get an enthusiastic thumbs-up on the rendering of color and detail, with an emphasis on 3-D-like image quality. So I will take that under advisement. 🙂
Thanks for the advice here!