But my main worry would be - post processing.
So much can be done with even cheap pp programs to picture quality that I wonder after skillfull pp how much real word difference there would be when using moderate apertures.
From what's reported so far, the big advantage of Zeiss 55 will be corner sharpness wide open. For those who need that, well price could be no object.
It's mentioned that mere mortal lenses can be similarly sharp in the center wide open and when stopped down. Early users are also reporting the Zeiss is perhaps too sharp for portraits, calling it "Portrait for perfect skin" lens, so for non-model adults I shoot, I would be stuck with less post-processing time with my L primes.