I have used the plain Jane EF to RF adapter ($99.00) for a number of my EF lenses on my R. Included were 50mm f/1.2, 85mm f/1.2, 10 mm, 100-400 etc. It worked flawlessly with all. I don't use the control ring much but I ordered the control ring adapter as well as a R5 - still waiting for a delivery time. So I have some RF lenses but am also using my EF lenses with good results.
Be aware that finding the Canon brand adapters may not be so easy at the moment. 3 weeks ago I wanted to buy the basic $99 adapter. All the big named stores, including the Canon online store, were out of stock. Luckily my local small photo shop had them in stock.
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