Those are going by Nvidia's still fluffed numbers. The real numbers look more like this.
PS3 | RSX: 176 Gflops and Cell: 230 Glops, Total 406 Gflops
360 | Xenos: 240 Gflops and CPU: 77 Gflops, Total 317 Glops
PS3 based on raw performance is 28% more powerful than the 360.
The reason the raw performance figures did not line up with multi platform titles is because Cell and the PS3's RSX were notoriously difficult to develop for. Non unified split ram, multiples SPE's, less overall memory to work with etc. The GPU was actually weaker, and could only overcome it piggy backing off some heavy handed Cell SPE usage. Sony first party had the time and development resources to do this, which is why PS3 first party titles are the best looking and most technically impressive this generation.
Very different situation now...
PS4 | GPU: 1.84 Tflops and CPU: 100 Glops, Total 1.94 Tflops
Xbox One | GPU: 1.31 Tflops and CPU: 109 Gflops, Total 1.41 Tflops
PS4 based on raw performance is 38% more powerful than the Xbox One, but without any of the previous issues that plagued the PS3, and with a whole host of other advantages over the XO. This time it's the PS4 with the unified ram, the higher ram bandwidth, the higher ram availability etc. It's a completely different situation.