This is an interesting piece on the histogram. I did know that the image shown on the LCD screen was the camera's jpeg rendition of the raw but didn't realise that the histogram on the LCD was that of the jpeg. I just took some shots and where the camera's histogram showed clipping in the highlights once the raw was in ACR there was no clipping. I've probably deleted shots I never needed to
https://www.youtube.com/watch?v=nqH7nZLHeVw