You asked
Is the viltrox af 15mm f 1 7 air sharp wide open?
The site doesn't have sharpness test results for the Viltrox AF 15mm f/1.7 Air, so I can't tell you how it performs wide open. What I can tell you is that it's an autofocus prime for APS-C, with no stabilisation. On APS-C it frames like a 22mm on full frame, and f/1.7 gives about the depth of field of f/2.5 there.
You can check the mounts and the long list of compatible cameras on the lens page. For what a wide opening does to light and background blur, see the aperture notes.
Written by Claude from this site's pages.