obviously these guys dunno wot they are talking about as they are comparing raw gpu numbers...lets put it like this
a lancer EVO X has a 2.0 engine.... yet it can take out cars like the holden commodore SS ( a 5.0+ V8 car) in a drag race..
so similarly comparing the raw gpu power of a 7970 with a ps4 is useless..
atm PS4 is far more efficient and renders graphics better than any pc.(if we stick with 1080p that is).
Infamous second son is by far the best looking game right now... and not even crysis 3 measures up to it given the fact infamous is a open world game rather than a linear game like crysis....
when ps3/ xb360 came out their gpus were equivalent to the Nvidia 7800gt and ati x1800pro.... yet if u look at the games like LAST OF US on ps3... i doubt a 7800 or x1800 would be able to run those kind of graphics..
reason is simple.... Consoles are highly optimized and far more efficient than a gaming pc,
I have a fairly decent pc... and after playing games on ps4..( they r v smooth)... i got the same results on pc which cost 4 times more than ps4
just take a look at that game Order 1886... there isnt any game out there that has better graphics than that.... PCs will catch up...but that would take afew years as games are very poorly optimized for pcs