See my Nikon mirrorless wishlist.
Following my recommendations for a Nikon mirrorless system, here is my recommendation for a Canon mirrorless system whose lenses rock. The Canon EOS R is a good camera, but only 30 megapixels, but I expect Canon to offer high megapixel camera before long.
At this point the Canon RF lenses below are so impressive that I am not recommended any other lenses yet. The Canon EF 11-24mm f/4L is an excellent lens but I hope an RF version is coming. In the meantime, it covers the wide end superbly.