personal opinion , i usually recommend zeiss for people with a need for branding
hoya seems to have a better hardcoat. Zeiss tends to focus on clarity
so for users who prefer clearer vision you'll find the greenish tint for zeiss lotutec coating less prominent compared to hoya, so lenses will appear clearer
whether you're being looked at or looking out
I tend to recommend aspherical/spherical 1.6 hoya for people who like spherical lenses (curve frames) or those who do not wish to use polycarb (softer material scratches)
i've not done any comparision of the recent coatings . the salesmen would try to say things are better these days though
zeiss excels more with lens design than cookie cutter lenses
and their customization /individual lenses
a guy told me things look more stable when you use their individual lenses , as in when someone holds the reading material instead of you, and their hands are moving it makes the material easier to read .
same guy tried the individual progressives and felt the field of vision is better . but no word from him for the single vision individuals
hoya has a wider range of lenses
for "normal " single vision
you have spherical/aspherical/double aspherical
according to a salesman from another japanese lab
double aspherical lenses reduce distortion for people with high astigmatism at rare angles
and thins the lenses more if you have that requirement.
exactly what i said previously but you never believed me