You asked
Is the sigma 16 28mm f 2 8 dg dn contemporary good for vlogging?
Yes, on a full-frame body it's a good fit. The lens covers 16-28mm, and my vlogging guide suggests about 16-20mm full-frame equivalent at arm's length, so the wide end does the job. On APS-C, though, it frames like 24-42mm, which is tighter than I'd want for holding the camera out in front of you.
Full-frame bodies that take it include the Sony ZV-E1 and the Sony a7C II. The lens isn't stabilised, so factor that into your choice. Whatever you pick, budget for sound from the start. The vlogging section of the video guide covers the basics.
Written by Claude from this site's pages.