UH what?
Are you serious?
Where does Unity look better on X1?It's the same. Frame rate is a mess on both (this is in the XB1 version:
https://www.youtube.com/watch?v=-YdgnxdzE5g and XB1 is 20ish during cutscenes while PS4 does better in that front).
The game is unfinished on both, but totally unoptimized on PS4 because they were clearly behind schedule with this project and run out of time, all the attention went to their lead sku which was the XB1 for this game.
COD runs at a higher res on PS4 with no tearing and the drops into the 50s during campaign mode aren't really frequent or significant, Evolve runs at a higher res and still is in alpha stage, there's room to gain a few fps.
Also you ask why Sony didn't bother overclocking the CPU but you're making no sense at all, different machines have different specs with different headrooms for changing specs late in the game (just like Microsoft coulnd't change their underpowered GPU when they realized they chose the wrong memory system going with DDR3 and esram too late in the game).
PS4 has a part of its GPU that is usable for CPU computing if it fits developers needs (something the clearly Ubisoft isn't even daring to use with this game).