Like Uncharted 1... Uncharted 4 set the "baseline" for fidelity on the PS4.
Of course successive games will look better, but it's not going to be a generational difference.
From here on out, the developer will remove various effects to use different ones or bolster some others to improve the overall image displayed.
For example... When the Playstation 3 and Xbox 360 launched, all the games were using Dynamic lighting, shadowing, nothing was really static. Towards the end of the generation though... All the details ended up being baked in the texturing or pre-calculated.
Take the jump between Halo 3 and Reach for example, they ditched the triple buffering, HDR, Water Tessellation and other effects, threw in impostering and texture streaming and used the freed up resources to improve texture quality, particles etc'. End result is an overall better image.
Halo 4 took it a step farther and baked in the lighting and shadowing and used simpler geometry, freeing up even more resources.
The developers weren't pushing the system "harder" per say, just allocating their minimal amount of resources better.
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