m. Play the same game on both consoles and its pretty impossible to spot any difference - so all the above and the hype (so far) actually counts for nothing...!
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I'm many cases this is true, however as someone who has both consoles and occasionally buys the same game for both I can tell you that there can be a difference and it is noticeable. Maybe not so much if you only experience one device in isolation from the other, but when you have access to the same game and both consoles I can certainly spot differences.
I bought Dragon Age Inquisition for both lately so I could play through the game as different characters / classes & gender at the same time.
Whilst the game fundamentally looks the same the 1080p visuals on the PS4 are noticeably sharper than the 900p on the XB1. I notice it the environment and in distant objects. Is it a massive difference / game changing ? No - but it is still very much noticeable.
I recently re-bought Thief on XB1 as it was cheap with gold, despite playing through on PS4 previously and it too is noticeable in resolution not just because of the softer image, but the added aliasing that brings to the visuals when they don't add extra anti-aliasing to compensate, and despite it running at a lower resolution - I did notice and feel the frame rate running slower especially in regards to how the fluidity in the controls felt.
So yes it is noticeable - when there is things to notice (it's not impossible as you claim).
However, when there isn't a resolution difference and both are offering 1080p then it is a different story. SKYLANDERS : swap force & trap team look identical on both systems, Lego games look identical too.
So certainly there are games on both systems that look identical, and there are games that will always play identically - however I would still say when there is a resolution difference, if you have access to both devices / it would still likely be better served up on the PS4 from a visual standpoint.
That being said, exclusives like Sunset Overdrive & Zoo Tycoon are to me visual treats and match any of the gorgeous games on PS4, so I'd still buy both machines if I had to redo so.