Unlike some posters, I prefer to compare apples to apples instead of shilling for companies because I happen to have a lot of money tied up in a system. Just a personal preference.
And yes, we have LOTS of anecdotal preliminary evidence about exactly what the R5 is
You may have more tied up in posts and running around in circles than even in gear. We have anecdotal evidence !! As for RAW ... a good photographer wouldn't need to see a single RAW file from an R5 to realize they could buy one and produce some stellar images. They could get one the day of release, and proceed with success.
For photographers with more doubts about themselves, or certain camera's files, maybe this LINK will add some confidence.