I used to have a 70-200 f2.8 Mk I. This lens is in a different league for image quality and size/weight.
It is, dare I say it, small ...
It weighs a lot less than the older lens and can easily be carried as a walk around lens for a few hours without issue - I have done this and did not notice it.
The focus speed is great. The weight and size incredible for an f2.8 lens ... and the image quality even wide open simply stunning.
It is sooooo sharp ! Contrast great too.
I think of all the RF lenses I now have this is the best 'value' in terms of all it's attributes.
It balances well on an R5.
It is just a great lens., more than that is hard to explain .. try one and get one !