You asked
Is the samyang af 50mm f 1 4 fe sharp wide open?
I don't have test results on how sharp the Samyang AF 50mm f/1.4 FE is at f/1.4, so I won't guess. What I can tell you is that this is the 2016 original, which is heavier than the II, and it's a Sony E mount lens that fits full frame and APS-C bodies. You can see its full spec sheet and the list of compatible cameras on the Samyang AF 50mm f/1.4 FE page.
If you're shooting wide open for portraits, my portraits guide explains why f/1.4 leaves very little depth of field, and why stopping down to f/2.8 is often the easier choice for two people at different distances.
Written by Claude from this site's pages.