You asked
Is the ttartisan 50mm f 1 4 asph hard to focus manually?
I don't have anything on how easy or hard this lens is to focus. What I can say is that it's manual focus only, with no autofocus, so you'll be turning the ring yourself on every shot. Check the TTArtisan 50mm f/1.4 ASPH page for the mounts and bodies it fits.
Shooting at f/1.4 on full frame leaves a very thin band of sharp focus, so even a small miss will show. If your camera has focus peaking or magnification, use them, and stop down a little when you need more margin. If you've never focused manually, the portraits guide is a good place to see which focal lengths suit people and which are easier to work with.
Written by Claude from this site's pages.