You asked
Is the sigma 24 70mm f 2 8 dg dn ii art good for vlogging?
The Sigma 24-70mm f/2.8 DG DN II Art is a solid standard zoom, but I wouldn't pick it for vlogging by default. It isn't stabilised, and handheld vlogging, where you're walking and talking, depends on that. The site doesn't have footage or reviews of it for video, so I can't tell you how it performs on that front.
It does fit a couple of cameras that are built around video. The Sony ZV-E1 is full frame, so the lens frames as marked at 24-70mm. The Sony ZV-E10 II is APS-C, where it frames like 36-105mm, which is a comfortable range for talking to camera.
Before you buy, read Video for what actually matters in a vlogging camera, and check the aperture notes if you care about background blur.
Written by Claude from this site's pages.