>>2720915>Are long lenses with fast apertures considered a dead end on FF dslr's?No.
>I'm currently drooling over the Samyang 135 f/2 as a dedicated portrait lensIt's a nice lens.
>but I'm having doubts regarding the expected focus "hit rate"You should be worried.
>Anyone here with relevant experienceYeah, I have a shitton of manual lenses, and you need either a mirrorless camera or stick to the viewfinder. Start with a 70-200mm and shoot it at ƒ8-11 with fill-flash. Don't bother bokeh whoring at your level.