The CV-125 is not a better lens than the Zeiss Oti, just better "all-around," if you understand my meaning.
I do. Perfectly.
I don't have to choose only one lens and I use about half a dozen or so lenses all the time.
I subscribe to the biological truth:
no two competitors can occupy the same ecosystem. One will prevail.
The Zeiss, while technically sharper, can't do 1/10th the things I usually need to do ... that the CV
can do ... while the CV can do anything the Zeiss can do (and then some) ... close enough so that I don't need the Zeiss.
I am considering getting the Sigma 150mm OS Macro. Is there anything more you can tell me about that lens. They say it is very well corrected. Any thoughts?
To contradict what I said earlier, I think you'd be happier with the 180.
The 150 is nowhere near as sharp. Look at OToole's tests.
True, the 150 has better CA control, but that is easily fixed.
By contrast, you can't fix lack of sharpness wide-open + inferior bokeh.
As for various technical tests, etc. from the so-called "techspurts," I no longer trust many. You have to use a lens yourself and for more than a day or two in order to understand what it can do for you. In fact, I am slowly becoming a stranger to all of the online photography forums. I no longer get much out of the photo geeks and the fan-boys. I don't post photos here much anymore because half the comments just miss the point, IMO. I am not interested in others telling how they would compose my photos unless I ask for that (and I don't). I know it's just me, but that's all I have to work with, my own eye and sense of photography..
Totally agree with you here.
I respect anyone's opinion with more experience than my own (esp. with a lens I have not owned before).
However, once I myself have used a lens, then I no longer care about anyone's opinion than my own ... because only I can apply the lens to my own needs and determine if it's suitable for what I want.
When I see a dude use a CV 125mm on a black-and-white letter, up close, and draw inferences from this primitive result ... I can only shake my head ... as he's failing to truly appreciate all of the subtleties of what the lens offers. Not to mention the fact that when he fails to see how dull/unsharp the Sigma 150 is wide-open, in comparison to how sharp the CV, it just makes me want to hit the *delete* button on the article. But, then again, Sigma pays for a lot of what he does ...

As you know, I did have the Sigma 180mm macro, which is a great lens IMO, but I prefer the CV 125.
When I need quick AF for a macro shot (say a butterfly on a flower), I use my 300mm VR II which is better in every way than both of them. Better reach, can keep more distance, and cropped images from the 300mm VR II equal most distance macro shots IMO.
I am still doing lots of photography, but don't bother to share it, except a few on my Facebook blog each day. I do continue to track down lenses and buy them, just because I want to see for myself what's happening. Then I keep them or sell them. More and more of my work is done with the Cambo Actus and tilt. It's like I have come full circle, back to just taking photos for my own interest.
In the end, that's all you can do: photography for yourself.
Me, I am purging what I have in anticipation of a few Nikkor AF lenses (FL ED) ... and getting rid of some AI-S lenses in favor of either Zeiss or elder pre-AI all metal lenses, just because.
Winter is coming on here, so I am looking at some indoor projects.
Yep. I am going to be working on some websites and such over winter, as well as finishing a high-mag, super-macro studio setup on my desk/credenza, in anticipation of a new spring.
Cheers.