You asked
Is the viltrox af 50mm f 1 4 pro sharp wide open?
The site doesn't have test results for sharpness, so I can't tell you how sharp the Viltrox AF 50mm f/1.4 Pro is at f/1.4. I'd rather not guess. What I can tell you is that it's a full frame prime for Sony E and Nikon Z mounts, and it has autofocus but no stabilisation. You can see the full specs and the list of compatible cameras on its lens page.
Wide-open sharpness matters most for portraits, where the depth of field at f/1.4 can be thinner than a face. The portraits guide explains when to stop down to f/2.8, and why eye autofocus does much of the work. For a broader look at how aperture affects sharpness and light, the lenses guide is a good starting point.
Written by Claude from this site's pages.