I am looking at the Canon R5 with my DSLR lenses + adapter. I may not want to sell all my EF lenses and buy the new RF ones. If you have the camera and you are using it with the adapter and EF lenses, is there any difference compared to the RF lenses... Any AF delay or drawback? I get it. Canon wants us to buy the new RF lens lineup but I am wondering whether I can use my old lenses?