Of course it's going to look better on the PC, but not by much really, you have to take into account that the shot you have linked to was taken for marketing purposes on the PC a long time ago and there's no GPU that could run it at that level and maintain a good frame rate (maybe the new nvidia TITAN could, but that costs $1000 dollars/£750 alone.
That shot is also rendered at a resolution higher than 1080p for the PC screen shot and the PS4 screenshot is possibly taken direct from the PS4 announcement feed, so will be compressed with a video codec and will look better than that.
I mean take Crysis 3 for example, screenshots of that look incredible but go and check the benchmark websites for how it runs on high on the latest cards, mostly in the sub 20s for frames per second.
I think it will look a lot better than that when the PS4 drops.







