Canon's introduction of the EF 85mm f/1.4L IS USM lens was certainly exciting, particularly for portrait shooters, but it also muddied the waters a bit in terms of which 85mm option is the best among their three offerings. This great video compares the trio and will help you pick which is right for you.
Coming to you from Kai W, this great video compares the Canon 85mm f/1.8 USM, EF 85mm f/1.4L IS USM, and EF 85mm f/1.2L II USM lenses. It used to be the case that the f/1.8 lens was the affordable, solid performer, while the f/1.2 lens was the L class superstar known for its ridiculous aperture and bokeh, but also for the slower and more methodical manner of working it demanded because of its fickle autofocus (nonetheless, it's a staple of the portraiture world). Then, the f/1.4 lens arrived with a middle aperture and the addition of image stabilization, but Canon made it clear that it was meant to complement, not replace the f/1.2. In particular, you might be wondering whether the f/1.4 or the Canon-ball, as the f/1.2L is often referred to, is right for you. The video above shows that despite being only a third of a stop apart, there are some other differences that set apart the f/1.2 and f/1.4 as distinct lenses intended for different photographers.