So, after a few days, I can honestly say, I love the R5. The stills image quality is superb and the AF is such a step forward from the R it makes taking images of moving things so much better. No overheating issues even though temperatures in the UK has been quite warm 30 degrees yesterday.
The biggest gripe I have is setting the cards up to save what I want to each card and then trying to import onto my MAC when Lightroom doesn't support CR3 RAW files.
I used to have 2 cards in the 7d MKII which was pretty easy to set up but even following the manual I cant seem to get it how I want. I know it's not supposed to be a manly thing to do to refer to the manual but I will re read it and try different settings.
I downloaded Adobe DNG 12.4 Beta but for some reason it wouldn't recognise my card so I resorted to importing as JPEG. Not great. Come on Adobe get this plug in sorted!
Update
I was going to upload one of the 1st images I took after setting the R5 up, using animal AF. It's not an amazing picture from a composition perspective but as she is a black Labrador with very dark eyes, I have always had issues taking decent pictures that show the coat and eyes well. I'm quite please as a 1st attempt, especially as the background is quite a contrast to her coat. The eyes are in perfect focus and can be enlarged so that one eye fills the screen and is still pin sharp. Something I could never do with the R.
I tried uploading the image but it tried and told me the image was too large. I could reduce the size but sort of defeats the object really. I give up lol.