Kiwimochi wrote in post #13429195
Is it just the collection mentality, why is that we need 18/21/25/28/35 ? aren't they so close to each other?
My habit has been to skip focal lengths, i.e. 19, skip 21, 24, skip 28, 35, skip 50, 85, skip 100, 135, etc. These days I'm just the opposite: 21, skip 24, 28, skip 35 (but I have one...), 50 (there isn't just ONE good for both close, wide open AND longer focus stopped down...), skip 85, 100, skip 135. As I found most Canon WA offerings lacking in magic, I went Zeiss. I come from a disappointed Nikon guy with 15 lenses to lover of Leica glass, and only 9. I don't think everyone can really "see" the difference sometimes. You have to love things like harmonics.
Someone mentioned the 17tse. it's MUCH wider than the 21 ZE and really not nearly as sharp as the 24tse, which is probably sharper than the 21 ZE. But sharpness isn't everything. There's color rendering, etc. Someone also commented that the 18ZE is bleah, so maybe reason enough for the 17TSE. But like many ZE lenses, I think its more a matter of proper purpose than being crap. The 50 1.4 and 85 1.4 get a lot of crap from reviewers that look at charts.
(Sorry for the 3 in a row; I just discovered this thread and it's very interesting to me.)