Take my opinion with salt. It's just that all the consumer lenses like the NEX 24mm/f1.8 don't conjure the feeling of build the same way the Zeiss and Voigtlanders do.
The 12mm build is good but not legacy lens good, at least the manual focus is not focus by wire. I suppose to make it light and small is more important? The voigtlander nokton m43 25/0.95 though is very well built like other cv lenses. Is Nex CZ 24 considered consumer, the price certainly not typical consumer, maybe the built is, haven't really held it.