Some very critical notes about this test are comming from Mr. Puts, who has been tested Zeiss lenses and Leica lenses in the past very extensively. (http://www.imx.nl)
For film to survive we need an honest appraisal of its outstanding features and characteristics. A recent claim by the marketing department of Zeiss, that they had succeeded in resolving 400 linepairs per mm with the new 2.8/25mm ZM lens on yet another special and super film (yawn yawn) and developer, this time one of the Spur developers by the German company Schain is far beyond honesty. It is simply impossible. The 2.8/25mm has been tested by me quite extensively and will deliver at most 200 linepairs per mm on aerial (projected) resolution. There is no way that this lens can come close to the mythical 400 lp/mm on film. To deliver 400 lp/mm on film, the lens must be capable of doing at least 600 lp/mm and that is even for a Zeiss lens designed for general photography several bridges too far. This yardstick has been introduced by the infamous Gigabit film/developer, the creator/manufacturer of which simply stated that if you cannot get this result you are not worth using the film. Strong opposition to this type of reasoning came from a small German company that marketed very good developers for TechPan films. They were fully correct in claiming that (a) resolution is not the alpha and omega of film quality and (b) such a high-resolution figure is nonsense. This small company was Schain. It is ironic that the company now supporting the same claims that the Zeiss marketing people make, is that same Schain company!
Zeiss marketing made the same type of claims in previous articles, then for the Contax lenses. The subtle difference is that the statement then was that the resolution could only be made visible by special enlarger lenses made by Zeiss and now the claim is that the resolution is only visible with high magnification microscopes. The pattern in all these claims from Gigabit to Zeiss marketing is the same: the performance is claimed, never substantiated and when challenged the answer is always most evasive.
We should forget about these claims, they do more harm than good in the current climate of assessing film as being fit for the future.
The truth will be somewhere in the middle because I do not think there are a lot of companies, persons who can do a regular test on these high end lenses and film and reproduce spec's like Zeiss or Leica can do.
I think the differences with the Zeiss/Leica M7/MP and their lenses are so small that 99,5% can not distinguish it on a perfect print of 30X40cm and a good regular slow speed B&W film.
If you want to buy a high end RF (film) camera now, you have an extra choice. The question is for how long period of time these kind of cameras will be available on the world market. Let's hope there a still enough people who like a high end film camera product in the future.