I have used the various Sigma 'macro' models on occasion. Good to excellent, but not outstanding.
If you read the comparisons, the Sigma 180mm
f/2.8 OS is
significantly better then the Sigma 150mm as well as the Sigma 180 f/
3.5 it replaced.
I have used the various Sigma 'macro' models on occasion. Good to excellent, but not outstanding.
As Nikon and Canon macros go, the Sigma 180 f/2.8 is outstanding.
As Nikon and Canon super-telephotos, the Otus lenses, etc. go, the Sigma 180mm f/2.8 macro is decent to pretty good.
The various Micro-Nikkors are equal or better, with the exception of the AFS 105/2.8 VR that delivered a disappointing performance and quickly was replaced by the APO-Lanthar 125/2.5. Thus this Nikkor has the dubious distinction of being the *only* F-mount Micro-Nikkor *not* in my possession.
This is true, based on the
elder Sigma macros.
I don't think a single Nikkor macro equals the results of the
particular Sigma 180mm to which I referred, as tested by a wide variety of sources.
I too went for the Voigtländer 125mm f/2.5 APO Macro, after reading the praise Michael Erlewine wrote about it, and why. (Apparently, he got his information from you and Eric.)
I used my Sigma 180mm macro as a telephoto also, so I liked the AF, and made use of it often (as well as the reach).
However, after upgrading to the Nikkor AF-S 300mm f/2.8G ED VR II (a lens with better specs than either macro), I no longer needed the fast AF of the Sigma, and use my 300mm as both a telephoto and a macro on "fast" or "flighty" objects.
For static macro shots, where I have the time to compose, I really enjoy the Voigtländer and can't see parting with it, ever. Also use it for short telephoto on still subjects, such as basking lizards, or portraits.