I don't currently own or use any RF lenses. My entire lens protfolio is EF. Many of these lenses have been aquired over a lot of years and I'm slow to swap out unless there is a strong incentive. Sometimes, "new and shiney" isn't enough for me. Although a new RF 85mm f1.2L for it's improved AF and sharpness, the RF 10-20mm for it's easy portability and the RF100-500mm LIS (replacing my venerable and trusty EF 100-400mm L II) would give me a lighter lens with a little bit of extra reach.
The EF 135mm f2.0 L is such a sweet lens and one of the few original (mk1) fast primes that render sharp images wide open on current top tier 45mp sensors.
For me, I had a long term love / hate relationship with the EF 50mm f1.2 L. I loved the build and reliability, but it's AF was as inconsistent as an early Sigma and I've had copies that just were not sharp regardless of aperture. For me, the RF 50mm f1.2 L is an obvious choice and I can't see any reason for the EF version otehr than price point or that it's already in your bag.
If the EF 24-70mm f2.8 L (mkI ) was a little sharper wide open on my R5, I would still be using this lens today. It's such a sweet lens, apart from wide open sharpness, it's better in many ways than the later mkII or even (dare I say it) the RF variant.
My EF 400mm f2.8 LIS mk II isn't going anywhere soon....although not as light and the later mkIII / RF version....it's so sharp with 1.4 or 2x TC's when shot wide open.
No love for the EF 35mm f1.4 II L? Is it too close in performance to the current RF 35mm f1.4 L VCM?
Other lenses like the EF 85mm f1.2 II L, EF 8-15mm L Fisheye and EF 11-24mm L are all lenses that have been suceeded and improved upon by RF mount variants that are all slightly superior in one or two aspects....however are still amazing optics.
