I just thought of a major factor in GoW’s favor. GoW has traditionally done much better, sales-wise, in the US. GoW 3 still sold great, despite the ps3 selling fairly poorly in the US. But for the new God of War, ps4 has a very healthy install base in the US.
It would be interesting to compare the US sales numbers for ps3 when GoW 3 released vs. ps4 now when GoW is releasing.