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Thanks for the response. I'm looking to put together the smallest/lightest 2-3 lens FF kit for backpacking - the next 4 months will be mostly high alpine. I've been very happy with the size and versatility of the V-S 35-70 and looking to add a Contax 28/2.8 and possibly a 100/3.5. IQ of both of those lenses stopped down are very encouraging and Zeiss-like.
Right now I'm using a 24 TS-E, 35-70 and Canon 70-200 or 90 TS-E - great kit but too heavy - I have a 24-85 N at Conurus. I find anything wider than 24mm is too wide so 28mm should be ideal. I had the Z 28/2 but sold it - too bad - loved that lens. The Contax N 70-200 is nice and small and a little lighter than the Canon.
For your usage, if long length of lens is not problem is Contax Vario-Sonnar T* 4/80-200 C/Y, it's still quite light. Very Zeiss like rendering. If you don't like it you won't loose much, I paid 180EUR from mine and it's like new.
I'm actually using it my main lens above 100mm where ZE series lenses end at the moment (really hoping 180/4, 200/4 or 250/5.6 or SOMETHING from Zeiss...).
Some 80-200 images:
For wide end, for myself 28 doesn't work well with 35. They are too close in field of view. I would rather use Contax Distagon T* 2.8/25 C/Y, combined to 35-70 (well, I did last summer...). Some thing that this lens is not sharp and has corner issues. I don't know maybe I got exceptionally good copy, but I have no such problems. Lens has curvature of field like it's never version 25ZF. If you end you buying this lens then I would recommend to make 110% sure you get Japan version - there was design change and the old version is not good. Distagon 25 is actually 25.9mm so there is not THAT much difference to 28mm, but enough that at least for me it works much better with 35-70. Some samples below: