Yesterday I had gotten the chance before the official opening of the last day of Photokina to speak to Dr. Nasse of Zeiss and put the new 1,4/55 on my HCam. It renders an Aptus 8 with 40Mpix (44x33mm) with very slight vignette in the corners.
The new 2.0/135 is completely free of vignette and will probably render a full 80 Mpix Leaf or Phase.
I will still need to get a 15mm Distagon Sample with removed sunshade from Zeiss to try with HCam (hopefully this will happen after Photokina).
These new lenses do a have a large potential and are definitely worth any cent they will cost (a lot...).