MJPerini wrote:
It is certainly a personal choice, I own a 5D4 & 1DsIII, Lots of lenses. I have not yet purchased an R body and will probably do so when they make an R5 II. Canon has done a great job with adapters that not only work, but can add a control ring to EF lenses. I suspect I will keep the EF lenses and perhaps add a few RF lenses over time.
Canon has made it easy to keep older lenses so I suspect I will.
I wouldn't rush into selling anything.
If you do use an adapter, my personal preference would be the polarizer rather than the control ring, the multi function button makes it very easy to change settings on the camera while that polarizer will work with any of your EF lenses. Because it does employ corrective glass I was weary of its effect on image quality and am happy to say I have not been able to detect any image loss using that particular adapter.