So a GTX 760 is as fast(or close) as a 780ti?
That's about a 40% difference between the 2(maybe less)
What are you talking about??
A 780 ti is more powerful (hardware wise), but you of all people should know that it isn't the only factor in how it will perform. You say you are a PC gamer as well so you should know it is the sum of all parts that will dictate actual real world performance. Not only that but it is the SOFTWARE that will leverage that power.
For all we know due to the size of Destiny + the A.I. code running in the back for all the enemies + particle simulation etc, the extra horsepower of the PS4 was put towards making the framerate and texture filtering more refined. Obviously the game looks slightly better on that system and the texture filtering is superior.
Bungie did make use of the PS4 extra horsepower even if you don't want to admit it.
That is where I'm going to end my discussion on it. I don't feel like getting into it any further. I feel this should be common knowledge.