PS3 vs 360 where 360 had the better quality games wasn't a hardware power issue, it was an optimisation issue for PS3. Ps4 vs Xb one is simply a hardware power issue.
So the generations are different as to why games are not exactly equal in quality. Also it's not only a fps and res matter this gen. There are other performance issues as well. And even if it was, the fact that xb one often can't reach 1080p locked 30fps (for example) means if the hardware was pushed to that res and locked fps the game would suffer significantly in other areas.
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