In Fuji's case it is not compatible with phase-detect AF.
That's inevitable, but of course as a latest development, the light loss might not be as severe.
Personally, the EF 85/1.2 already hits the mark, where the blur doesn't need to be smoother still (for way less money). Looking at STF examples, in some cases it looks too smooth for me to the point of not being as characterful.
The EF 85mm f/1.2 L (and II) get that smooth bokeh because they leave a lot of field curvature uncorrected. That means they don't do well shooting flat test charts at short distances, which is apparently the holy grail these days of judging how good a lens is, even for photographic tasks that in no way resemble shooting flat test charts at short distances.
The EF 85mm f/1.4 L IS, for instance, is much more corrected for field curvature. It's bokeh is more between "meh" and "bleh" than "creamy" when used wide open. But many folks think it is a much "better" portrait lens because it "is so much sharper on the edges" (when shooting flat test charts at relatively short distances).
By the way, if test charts were shaped like a portion of a sphere, lenses with uncorrected field curvature would wipe the floor with highly corrected flat field lenses, which are designed specifically to image flat, two-dimensional subjects that are perpendicular to the lens' optical axis.
The EF f/1.4 IS is very new and fantastic.
My point exactly. See above.
Speed of focusing will be interesting.
The RF 85mm 1.2 II is slow (but 1.6 times faster than the 85mm 1.2 original).
That's because it is basically a double Gauss design with the entire front group moving when the focus is moved. That's a lot of mass to move!
Get the EF 85 1.4. It is a FANTASTIC lens. It'll probably one of the later lenses to be updated to RF since it was released recently.
My point exactly. See above.
If you can get stopped down ( 2.8-ish ?) sharpness from a 1.2 lens and still keep the 1.2 style bokeh, that's amazing.
It's really kind of the reverse. You get f/1.2 bokeh, but the light transmission is usually around two stops darker, so about T2.5 for an f/1.2 lens. And they weren't known as "soft focus" lenses for no reason back during the last big fad for them in the 1980s.
Maybe this is one of the "concept lenses" which were mentioned by Mr. Mizoguchi in the interview with Dave Etchells at Imaging Resource.
It's not really that new of a concept. LF lenses like the Rodenstock Imagon have had "sink strainers" that do the same thing for 100 years.
This got to be a fad with 135 format SLR lenses in the late 1970s and the 1980s. Here's the way Fuji did it.
hmm would be nice if canon prints little lens test pattern inside lens cap ,everyone would have then equal tool to test their lens copy quality . everyone takes pic from it from 2meter away and compares 100% crops.
My point exactly. See above.