The new Sigma 50mm ART lens is supposed to give a very close Zeiss Otus performance. But we still don’t know yet what the price will be. But according to Photorumors we can expect Sigma to ship the lens in May. This is what Sigma stuff present at the Photography show in NEC (Birmingham) told to a Photorumors readers.
Sigma already confirmed the lens will come in A-mount too (article here). And a first quality comparison with other 50mm lenses has been posted last week (article here).