This guy does a pretty good job at showing the difference between Highest and lowest setting on.
I've been been watching his vid every once in while for may be six months now.
It's pretty obvious are so fined tuned for 7 years old console that the difference can be minimal between high end and low end setting. There are also lot of details that are lost due to compression still it gives a picture of the situation on.
But at this point I'm convince that even half a TFLOPS deficit in one system vs another won't prevent the lesser system to run the same game and do the same stuff as the more powerful set-up.
The difference may touch to not that obvious stuff (better lightning, shadowing) which in the heat of action...
Actually a significant gap in CPU power actually migh prove more problematic than in between the GPU.
This gen required a lot of efforts to tell system a part. And people were especially regarding as one system had been touted way more powerful.
Depending on the PR line next gen it could not be the most sensible subject. It could be about the while environment, fee or free and overall online policies, inputs methods, the Os, etc.. and always critical the price.
People got mental this gen about comparing the ps360 because they were so close. if the difference had been a bit more obvious it would had turned into a non subjet way earlier. And the focus would have been elsewhere.
EDIT
I also believe the limitation of the display which are a non subject are taming the difference.
Constrast is not that good, high luminosity for display not that high. Then there are color, thing are compute in fp10 or more quiet often and ended in RGB.
It's a bit like a guy that would have a great guitar set-up, tube amps etc. and then record in numeric with shitty analogic/numeric convertor, with weak dynamic range, low sampling rate, etc.
That's a bit the situation, thing are somehow tamed down by the average display.