You asked
Best wide angle lens for the sony a7c ii?
For the a7C II, a full frame body, wide lenses frame exactly as marked, so you can choose by focal length alone.
If you want one zoom for most wide work, I'd start with the Sony FE 16-35mm f/2.8 GM. For a fast prime with a very wide view, try the Sony FE 14mm f/1.8 GM. A wider aperture gives you more light and more background separation, as explained on the lenses page. If you need even wider framing, the Sigma 14-24mm f/2.8 DG DN Art covers 14 to 24mm at a constant f/2.8.
Written by Claude from this site's pages.