I'm actually surprised that thread was locked. Everything that needed to be said has pretty much already been said, I guess? I don't know, but if that's the case, I can't wait to see the games that showcase this. It doesn't surprise me in the least bit that devs, when they start development are more immediately able to see notably stronger performance on the PS4, considering it's the stronger hardware and also the easiest to extract power from, but when all is said and done, and the games are fully optimized for both, I don't expect to see a 40%, much less 50%, difference between the two systems. It takes almost nothing for a dev to simply lower the resolution on the Xbox One version to achieve good performance with the same visual bells and whistles on display on the PS4 version. The real challenge for the Xbox One will probably come when more GPGPU related effects start showing up in games, as that, imo, will end up being the biggest differentiator between the two.
Either way, first parties will be pretty exciting.