You asked
Is the sony fe 35mm f 1 8 sharp wide open?
I don't have a sharpness rating for the Sony FE 35mm f/1.8, so I can't tell you how crisp it is wide open. The lens page covers the basics: it's a full frame prime, it's autofocus, it's not stabilised, and it works on Sony E-mount bodies, including APS-C ones, where it frames like about 52mm. You can see the full spec list on the Sony FE 35mm f/1.8 page.
For what f/1.8 does to your pictures, the Portraits guide explains how thin the depth of field gets, and the Lenses guide explains why wide apertures help in dim light. Those pages won't settle the sharpness question, but they'll help you judge whether f/1.8 suits what you shoot.
Written by Claude from this site's pages.