PS4 vs XB1 Graphics Discrepancy Not As Big As Last Gen?

[fatslob-:O]

zero129 said:

And what about anyone who trys to use Ghost X1/PS4 or any of the other X1/PS4 early unoptimised games to try proving how big the difference is? do they lose credibility??.

How does one simply go about the conclusion that a game is unoptimized ?