You asked
Is the viltrox af 75mm f 1 8 evo sharp wide open?
I don't have sharpness test results for the Viltrox AF 75mm f/1.8 EVO, so I can't tell you how crisp it is at f/1.8. What I can tell you is that it's an autofocus APS-C prime, not stabilised, and it fits Sony E, Fujifilm X and Nikon Z mounts. The lens page has the full specs and the list of bodies it fits.
If you're mainly after a soft, blurred background, the portraits guide explains how f/1.8 behaves at 75mm. For what a wide aperture does to exposure and blur in general, see the lenses guide.
Written by Claude from this site's pages.