While I'm generally in full agreement with the post above, I'd like to comment, without disputing, just one point made ...
ZeissFan said:
(snip)
Now, the real question becomes this: Is the consumer willing to pay for that extra attention to detail and quality that goes into a Zeiss product? Are we willing to settle for "good enough?" Or should we expect -- no, demand -- that a company such as Zeiss (or Leica, for that matter) to produce the best that it can?
(snip)
There are many aspects to the quality / price issue, and in lenses the major ones are consistency, optical performance, speed, durability and appearance.
The main aspect in which Zeiss and Leica seem to be ahead of the competition in quality appears to be in consistency, which comes from manufacture and assembly under a careful QC program which catches and rejects anything that doesn't meet the standards. At least, that is their reputation.
In comparing CZ/Leica with (say) Canon or Nikon, speed is rather a non-issue, as both camps produce both fast and slow lenses. I doubt also if there is much to choose in durability between CZ/Leica lenses and the "pro" lenses from Japan (such as Canon L series lenses). CZ/Leica do not produce "consumer grade" lenses and to compare them with those from other makers would make little sense.
Appearance is another issue, but largely a question of taste. This leaves optical quality ...
Now I have already accepted that CZ/Leica have at least the reputation of better consistency, but for me the jury is still out on the optical quality issue: it would be interesting (for me) to see the result of a series of blind tests of judging the optical quality in real photographs (not 100%+ crops of details from the edges) comparing CZ and/or Leica lenses with decent examples of (say) Canon L lenses or even CV lenses. To make the tests meaningful, sets of photos would have to be similar (but not necessarily identical) in subject, lighting and range, and the lenses would have to be of similar focal length and speed, set at the same aperture, and carefully focused in all cases, using similar film or digital sensor. This would be in order to answer the question above "Are we willing to settle for "good enough?" or should we expect -- no, demand -- that a company such as Zeiss (or Leica, for that matter) to produce the best that it can?" -- to which I would add, after Leica and before matter: "and all the other manufacturers".
Personally, I suspect that the suggested test would be somewhat inconclusive, and I believe this is the reason that other firms may be a little less rigid than CZ/Leica in some ways ... and their market share among all levels of photographer, including pros and serious amateurs, seems to confirm this, namely that they are, in fact, "good enough". Maybe my suspicion should be that "Yes, good enough is indeed good enough". If people can consistently see the difference on a blind test of the sort described above, I'd be wrong, but surprised.
BTW, this is not intended to start a flame war, but I'd be happy to discuss these questions with an open mind --- that's why I wrote this ...