I found these 2 great videos by Keith Southern. Some very eye opening tests done and I thought everyone should see them:
https://youtu.be/zKWvTivA3N0
https://youtu.be/SZG6fRnMgNQ
https://youtu.be/zKWvTivA3N0
https://youtu.be/SZG6fRnMgNQ