Luckily for us "Godfather II" was filmed before CGI de-aging of main character. Young De Niro was great as young Vito Corleone. If there was CGI de-aging back in 70s i guess Marlon Brando could act both (old & young) versions, but i believe movie would lose a lot of its magic. Don't get me wrong, CGI is great for some movies, but in this case it works against story instead of helping it. For me story and acting was completely lost due to CGI face flattening. De Niro can act with eyes alone, but they changed his eyes as well. I really felt sad watching great actors as they try to tell us interesting story, but i could help noticing how they all look like wax figurines, motionless and lifeless.