The first question is, you either want an ultrafast long portrait lens or not.Still no proper reviews from Gordon or Jared or anyone?
If you do the second question is, which one. If you wish to stick with Canon, see my above post for resolution: I'd rank it 10/10, giving high contrast two-pixel-tall lines in the corners on an R5 at f/1.8. The RF is clearly better than the EF, slightly so in the center and almost unfairly so in the corner.
Comparison of EF+convertor, vs. RF, basically the same weight (925g vs. 1060g), same length, with RF slightly larger girth. This is actually a surprising result, as EF lenses tend to be very different size than the RFs: the 50/1.2 seems to have doubled in size while the 24-105/4 shrank 30%.
For me the only other two factors to weigh are AF time and accuracy, and how many stops of IS. I can report the RF135 is nowhere near the advertised 8 stops, but just thinking about it I'm sure it's at least a stop or two better than the EF. Likewise the EF focuses fast, but RF seems faster, though I haven't tested.
I admit I'd like to see the spherical aberration back to back, but I think most people can already make a decision on resolution, size, and personal finances.
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