Vitaly, maybe I'm wrong, but I think this lens (and the 35 and 45) is a completely new one designed from scratch for mirrorles, not just the adapted dslr version of the topic. (Delete the message if you want!)

Samples

https://www.ephotozine.com/article/sigma-14-24mm-f-2-8-dg-hsm-art-sample-photos-33714

I wish they would have made a 12-24 instead of 14mm

Samples

https://www.photographyblog.com/previews/sigma_14_24mm_f2_8_dg_dn_photos

Review

14mm

Center sharpness remains high through from f/2.8 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the center, with f/4 to f/11 producing the sharpest results.

24mm

Center sharpness remains high through from f/4 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the center, with f/5.6 to f/11 producing the sharpest results.

https://www.photographyblog.com/reviews/sigma_14_24mm_f2_8_dg_dn_review

Test

https://www.lesnumeriques.com/objectif/sigma-14-24-mm-f-2-8-dg-dn-art-p53131/test.html