Uncharted went from 6.8m on PS3 to 10m on PS4, that's a 47% increase in sales. So I'm going to give that to God of War which puts it at 7m (4.8m was GoW best sales before) and add another 1.5m for the positive buzz around it and settle with 8.5m.
For the record, I wouldn't mind being proved wrong.
Uncharted 4 is gonna end with closer to 12 million. As for GoW 3, didn’t Sony announce it sold somewhere around 5.5-6mill?
Uh.. shame on me for using VGC's numbers then. I might have to up my guess to 9m then.