Originally posted by Erictator I never owned a Zenitar to compare to, but from the pic's I've seen, the Tak is sharper?
I haven't bothered to do any head-to-head comparisons between the Takumar 17mm and the Zenitar 16mm because that's not my preferred way of testing lenses. But I'd been shooting with the Zenitar for a couple of years before I got the Takumar, and I've been shooting with the Tak since last September or October, so I feel that I can make some reasonable observations now.
The Zenitar appears superficially sharper. Superficially. It has strong edge contrast with a similar style to modern lenses, so people who believe that strongly defined edges are what sharpness means will like the Zenitar. The Takumar doesn't have that immediate sense of hard-edged crispness, so at a glance you might think that it's not as sharp as the Zenitar. But the Takumar has got better micro-contrast, giving a sense of three-dimensionality and more fine detail than the Zenitar. Plus much nicer handling of transitions between tones, which is something that I personally care about a lot.
And of course the 17mm has got the Takumar colour rendering. The Zenitar gives brighter, punchier colours that will probably appeal to those who prefer the style of modern lenses, but the Takumar has got a much more subtle and naturalistic colour rendering that I personally prefer.
Don't get me wrong, the Zenitar is an excellent lens that I can highly recommend, and if I knew I was going to have to shoot wide open then I'd go for the Zenitar over the Takumar. I'm very aware that my opinions are just my own opinions rather than objective facts, and of course others might have different feelings about the lenses. But the Takumar 17mm is the one that usually goes in my bag.