Correction, Destiny is seeing parity.

Clearly, one optimization hits 1080p 60 or at least 1080 p 30 then we're gonna see a lot more content in games, like open world or hundreds of thousands of npcs etc...

If optimization is equal and both the XB1 and PS4 hit that target, then even still the PS4 will still be able to do more.

Any Parity is pretty much manufactured at this point.

Last gen the PS3 was a lot more powerful, just harder to optomize for than the 360.

This gen, the PS4 and One use the exact same architecture and the PS4 only has marginally better components. As devs get better at optimizing for x86 on the consoles, games will probably look much more similar either way.

Heck, the One has the best looking game currently (Ryse), and even with lower pixel counts the games look almost identical in real life.

Parity is manufactured, but it exists, period.

Devs arean't going to milk every bit of power out of the PS4. Just look at last gen. The PS3 was capable of much more, but the 360 outperformed it most multiplats. Third-party games will look even more identical this gen than last.

You may see some differences in first-party games, but even then I doubt we see a striking difference like TLOU with the PS3. Hell, the One has the best looking game now with Ryse (and you yourself have said many times, it doesn't matter if it's open world or closed, but that's another topic entirely).

Last gen the PS3 was a lot more powerful, just harder to optomize for than the 360.

This gen, the PS4 and One use the exact same architecture and the PS4 only has marginally better components. As devs get better at optimizing for x86 on the consoles, games will probably look much more similar either way.

Heck, the One has the best looking game currently (Ryse), and even with lower pixel counts the games look almost identical in real life.

The PS4 doesn't just have marginally better components. The GPUs are similar but the PS4's has 18 cores vs the X1's 12. That's a 50% power difference in the GPU alone, the most important aspect when it comes to graphics.

Last gen the PS3 was a lot more powerful, just harder to optomize for than the 360.

This gen, the PS4 and One use the exact same architecture and the PS4 only has marginally better components. As devs get better at optimizing for x86 on the consoles, games will probably look much more similar either way.

Heck, the One has the best looking game currently (Ryse), and even with lower pixel counts the games look almost identical in real life.

There is so much wrong with this post. The PS3 wasn't a lot more powerful than the 360. The RSX was significant weaker than the 360's GPU. Most of the Cell's computational advantage over the 360's CPU had to be used to compensate for the RSX's short comings. Even then the Cell's general purpose processing abilities were worse than the 360 CPU. The 360's memory setup was also superior to the PS3's and  it had slightly more memory available for gaming. The PS3 had the edge but it games had to be built from the ground up for the architecture and the differences. Even so it had clear disadvantages in comparison to the 360.

The PS4/XB1 situation is completely differently. Both consoles have similar architectures with the PS4 having significant memory bandwith and GPU rendering advantages. Last gen, developers had to put in more time into PS3 software just to get similar results to the 360. This gen developers have to put more time into the XB1 hardware for inferior results. 

@VanceIX

Your PC comparison is apples to oranges. PC games aren't optimized to take advantage of the hardware like console games are. The games have to be made with the lowest common denominator in mind. 

It's hardly a 50% power difference in real life performance. 

If cores made games so much better, PCs would be running circles around both the PS4 and Xbox One. The 290x has 44 CUs, does that make games 244% better IRL performance? Not really. It's all about optimization, and devs aren't going to spend extra resources making the best game possible on PS4 when they can just port the base x86 optomized game to both.

The PS3 had 8 cores compared to the 360's 3 cores in the CPU, look how that turned out. No one bothered optomizing for the PS3 anyway, unless it was a first-party exclusive like Uncharted or TLOU.

Like I said, the best looking game is currently on the One, and multiplats look much more identical than they did last gen, where 360 had an obvious advantage.