I have some doubts about portraits, I'm not sure if these are technical questions about lenses or about my skills as a photographer.
I recently purchased the canon 100mmL 2.8 macro lens and I am loving it, also for portraits. It is very sharp, also wide open. The thing is that even at 2.8, I often have problems having everything I want on focus, in the example I attach one eye is not perfectly focused. I have previously used the 50mm 1.4 and 100mm 2.0 and would often avoid using them wide open for that reason.
I guess the questions are: ¿What advantages do you find in lenses such as the canon 85mm 1.2L or even the sigma 1.4 over the canon 100 2.8 for portraits? I can understand it may be easier with those to blur the background or they may have nicer bokeh, but do you use them wide open for portraits?