the performance gap is bigger this gen than last gen in PS4 favor but so far were only seeing this being used on resolution and frame rate. last gen the 360 had the advantage in the graphics department gpu for gpu 360 had the advantage
but until we see xb1 multiplats having issues other than running at the same resolution and FR than last gen would show the bigger difference last gen not only did the ps3 have the lower resolution and FR but it also had to cut back on graphical assets and effects as shown in the above pic this was also the case on the big popular games like RDR and COD
as far as 1st party games in my opinion last gen the ps360 where about equal when comparing like for like situations you cant say KZ>halo b/c halo is much more open and has many more features go look at gears vs uncharted comparisons
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