Upload & Sell: Off
I've complained several times on this forum that it seems to me that the mass market lenses of today don't seem to be anywhere near an order of magnitude of improvement in quality/size/price compared to prime lenses that were produced fifty! years ago when we did not have any computing power (for optical design/optimization), automated manufacturing & measurement/verification technology and knowledge of esoteric optical materials and techniques.
All the computing power in the world can't change the refractive index of glass. What can change the refractive index is additives such as lead, which were used in those 50 year old lenses and is illegal to use today.
Even optics R&D titans like Zeiss only have the monstrously sized Otus 55mm f/1.4 @ $4,000 to sell.
I don't know what you're talking about, Zeiss don't only have the monstrously sized Otus to sell, they have many normal lenses in many different price/weight categories.
But they're not all f/1.4 and do not have the level of correction wide open offered by the Otus or Sigma Art.
Even on the Sony mirrorless cameras where size and weight are prime selling points, both the semi-slow 35mm f/2.8 and expensive 55mm f/1.8 are much larger than I would have expected given the short flange distance and absence of a need for mirror clearance.
Until the ray angle problem is solved lens designers cannot exploit the short flange distance for mirrorless, especially for fast lenses.
So why can't Sigma or Zeiss or whoever dust off the designs for the Contax G lenses, update them and re-release them for the new APSC & FF mirrorless digital cameras?
Because ray angle issues the Contax G lenses don't perform as well now as when they were released (when film was far more tolerant of ray angles), which was also a time when consumers weren't as discerning as now when it came to resolution.
Hence the ultra-corrected lens from Sigma, that sadly has to obey the laws of physics, which don't go away no matter how much computing power you have. If you don't need that performance wide open there are plenty of alternatives.