Adding to my earlier comment. Another reason to "rush" is rising prices on RF lenses. My 100-500 RF was delivered in August. As of today's latest price increases, it is now $200 more. It used to be that it paid to wait a few years after a lens release, because the price usually dropped. But in today's upside-down COVID world, it's cheaper to buy now than wait and unless you pre-order, you may not be able to get a lens when you want it.I don't get the rush to sell off the EF lenses if you get a RF system.