Almost nobody will be able to see 15% difference in TF (which is the item with higher % difference, that being TF number,a difference much higher right now between both current gen consoles or even their refreshes) , unless we go to DF or pause the game and start pixel counting.
The other items, cpu and ram are around 10 maybe better? And not even sure since we don't know about smt on ps5 and ram configuration is only better on xsx for 2/3 of the whole amount.
And i doubt Sony went for such a high speed ssd tech to get 0 benefits compared to what is available on pc today (and what will XSX use)
So time will tell. The fact is Sony's approach is interesting, and some developers might find a creativeway to exploit that with ideas only can be done with such speedy ssd. And the fact is that MS approach is more or less 15% more powerful, and we already know what differences will that bring: a few fps more maybe or/and slightly better resolution. Oh, and not a tech guy, but also seems that using narrower and faster gpu it also has its own advantages over wider but slower. No idea what exactly though. I think both are closer that what these numbers may hint.