All new lenses are "special crap" for photography, Zeiss included, and most cases will not fit into requirement (or standard) of serious photographer. Many like that new lenses just because of "low" personal photo-standard, or they never saw work of a good lens.
The point is that new lenses are produced out of glass without Pb, Zeiss included.
Manufacturers have nothing to claim on their lenses except "resolution" and I never had a look at photograph under microscope counting lines per milimeters. Photography is about life, people, conditions,... blur but not sharpness, not about lines/mm. Now they are introducing "NEW" lenses with Aspherical elements, means they cannot get correction, and never saw good bokeh with that lenses (even and Leica included in some degree).
I have Nikkor 2.8/55 micro and will probaly get one more. I have no intention to even look at "new" Zeiss F2/50 MACRO. It cost well over $1600 (when include all payments) while Nikkor I can get new for $350. Even, I am positively sure, comparing photographs from that two macro lenses Zeiss will get very hard time to come even and close to Nikkor. Zeiss is still not out with that lens but to me as photographer what they can say opposite? For sure nothing more than e.g. 300 lines/mm. It means nothing to photographrs.
Well if you like to try Zeiss go ahead.
www.Leica-R.com