In person, the new lens is a relatively small, but beautifully well-made prime that fills a useful gap in focal lengths for both systems. On a Sony E-mount APS-C format camera, it is equivalent to 24mm, while on a Micro Four Thirds ILC it becomes an effective 32mm medium-wide.

Sigma claims that despite being a ‘C’ (Contemporary) class lens, the new 16mm should have performance in line with the company’s premier ‘Art’ series. As far as build quality is concerned, that’s definitely true. Mechanically, this lens is gorgeous – something that is exemplified in the large, very smooth manual focusing ring.
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https://www.dpreview.com/news/6329020538/hands-on-with-new-sigma-16mm-f1-4-dc-dn-contemporary