As my respected colleague Rick has said, if you are currently using an 6DII and are happy with that resolution, you will find the R6II not only a suitable fit, but also a massive improvement on focus, and face/eye tracking for games. It also features In-Body Image Stabilization that will work with most RF optics' own image stabilization to provide a much steadier platform for hand-holding for sports. The 24MP sensor is definitely a step up from the 6DII.
Only if you need the 45MP resolution would I consider the R5: whether you are going to have to do a lot of cropping, or produce large, detailed prints. The 'Refurbished' Canon deals are often just overstocked, opened but not used, or used for display - they come with a warranty and are 'as good as new'.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
