Zoran, I form a view based on the overall impression of lenses' signatures - not being overly concerned with file prep affecting on-screen sharpness, saturation etc.
You will also find that many such establishment sites do not rely on top flight image preparation - because they and in this case, Zeiss, know that users are most interested in the photographic
imprint - focus fade, subject depiction, OOF handling, focus selection (close here to illustrate MFD, for example). Some sites post truly awful images as seen at Luminous Landscape, despite often good information. The Loxia images recall the signatures of recent ZE/ZF lenses, to my eyes.
Being a CZ user for many years I know they value photographic content of these kinds over matters like the portrayal of sharpness, etc. We might wish it otherwise of course. ;-)
Now to add some information gained from a Zeiss representative:
“We’ll add to the family in the future with wide-angles and short telephotos. The challenge with these mirrorless cameras is designing an ultra wide angle lens that does not exhibit
vignetting, lens shading and the ‘smearing’ effect common when using adapted wide-angle M mount lenses.”
This comes from a tidy website and is written by 'John vR', more here:
Updated: Zeiss Introduces Loxia Lenses for Sony Full Frame
I provide it because I feel that Zeiss are to some extent waiting and seeing how the uptake of the a7 series goes in general and of course how the reception goes for the Loxias. So - note the plurals used in 'wide angles' and 'telephotos', could be a slip of the tongue of course, but still perhaps not.
They have never been backward in coming forward about the need to match lenses to sensor toppings, and would be keen to put distance between adapted M class lenses and the 'factory' Loxia line, finely tailored for the job.
I like the separate identification of 'vignetting' and 'shading', not many users realise how poorly M lenses perform with respect to optical vignetting before s/w fixes are applied.