Hi
I bought this zoom in kit with my Yashica 108
some years ago and I am quite satisfied with it(I took some nice photos)
it has a good quality construction
(mine starts creeping just now)
It has some distorsion @28mm (it can be evident, it depends on what you shoot)
the main problem is that the front lens retracts deeply
@80mm, so you cannot use it with a rubber hood or Cokin system filters
(better, you find yourself with a 28-50 useable range)
@80mm it allows 1:5 reproduction ratio if I remember well (it focuses down to 0.48m)
I must say that it flares...
I did not compare it with Zeiss zooms (I do not have any), comparing it with
50/1.4 is not so fair
If you have more questions let me know
Hope this helps
Paolo
PS: there is one for sale on Ebay.com