In 500D, it shows at LCD mon 右下角 [ ] 括弧內個數字, but for 6D, before and after I shot a photo, the LCD mon is always black, shows nothing. I have not read the manual, hopefully I can find the answer.
For focus, I feel it is the same as my old 500D. When my kids are running/ moving, I can shoot a clear photo by pure luck only.
But ISO is really improved, I can shoot 12800 and 25600 ISO photos without much noise.