Not at all, parity means that everything is equal, not just resolution.
You can have the game run at 1080p on both systems, but if the level of graphical details aren't the same and the frame rates are different then you still lack parity.
TBH neither system is even close to fully optimized yet, both have a lot of room for improvements.
When you have a developer like Ubisoft that says they could achieve 100FPS in ACU if CPU wasn't an issue and the GPU can handle AI, Physics & Audio processing alongside graphical effects, but their game can't even run at a stable 30FPS at 900p it shows that the optimization and understanding of how to make their game work on the system simply just isn't there yet.
The hardware differences are static, the software on both has a tonne of room for improvements, you should never have parity between these systems unless the game doesn't require the full use of XB1's level of hardware.
