Forgive me if this shows ignorance, but size aside, is this lens materially better that the S 50mm 1.8?
Different flavor. Much more of a vintage vibe if it’s typical of Voigtlander lenses.
This statement can only come from someone who has never held an Apo-Lanthar in their hands.
The Z-mount Apo-Lanthars I know from my own experience, 35/2 and 50/2, have a very modern rendering.
Actually the absolute opposite of vintage orientation.
There are different lens lines at Cosina/Voigtländer, including many older lens designs.
For decades, proven, unchanged basic lens designs, where this is true.
The Apo Lanthar series, however, uses a very modern lens design, which is bred for absolute maximum performance in the context of the key data (small lenses) of these lenses.
Accordingly, both are currently reference lenses for full-frame format in terms of the quality/value of the optical corrections and the resolution, clarity, contrast right up to the edges, even at maximum aperture.
I know this is a controversial point, but the color reproduction, saturation and gradation of the AL-Z lenses is already exceptional straight out of camera.
The only thing that might trigger vintage vibes in an Apo-Lanthar, away from the operating concept MF/Aperture ring, is the pronounced vignetting wide open, but this can also be found in other modern lens designs.
Both are among the highest quality optically corrected lenses in terms of any aberrations with the exception of vignetting.
It's a flat-field lens which additionally gives you outstanding MFD performance, thanks to it's floating group design, very modern and fully equipped.
So here, too, the absolute opposite of vintage, where I usually have massive deficits from SA to severe color aberrations, field curvature, coma smearing and much more.
Both lenses also set new standards @ f/2 in terms of resolution, fine resolution, clarity and contrast right up to the outermost edges.
This is very contrary to what you find with vintage lenses or lenses with such an orientation.
___
Final Thoughts:
The Voigtlander 35mm f/2 APO-Lanthar is one of the best 35mm lenses ever produced!
https://www.fredmiranda.com/forum/topic/1695782/17/
Final Thoughts:
Small but mighty Voigtlander 50mm f/2 APO-Lanthar is one of the best 50mm lenses on the market!
https://www.fredmiranda.com/forum/topic/1625777/#chapter12