You asked
Samyang af 85mm f 1 8 p fe vs sony fe 85mm f 1 8?
Both are 85mm f/1.8 lenses for Sony E full frame, with the same framing, the same maximum aperture, autofocus, and no stabilisation. The main difference the site gives is weight. The Samyang AF 85mm f/1.8 P FE is very light at about 270 grams, which helps if you carry your camera all day.
I'd buy the Sony FE 85mm f/1.8 first if you're on Sony full frame. It's the camera maker's own lens, and it's the one I'd recommend to most people. I don't list its weight, so check that yourself if size matters.
Either lens gives you the flattering perspective and soft backgrounds covered on the portraits page. If you go with the Samyang, make sure your body supports its autofocus features, as the lenses page explains.
Written by Claude from this site's pages.