I can't really compare the two versions, but I can say that it runs and plays very well on PC, and if you have a beefy system that can push the eye candy, it will look way better than what you get on PS4. Compared to the PS2 and PS3 ports of FF games, this is an actual game that plays like it was made for PC. I recently played through the various FFXIII ports (First time I ever played them), and those are consistently buggy messes; though they more or less work after a few tweaks (turn off cloud saves; force large address aware); but they are also fixed to peasant resolutions with essentially no graphic adjustments available. And considering that those ports are still roughly $20 from Steam, you can get all of FF XV for about $20 or less on sale (as I did about a month ago); so it's a much better deal, really.
And it's a pretty good game. I haven't played it in a few weeks (sidetracked with the new AC), but I am enjoying things once they get rolling.