it's nice that they used PNGs, but the original capture is way too compressed to show any subtle differences...
I see a slight color difference, but that may be due to the output of the different consoles.... sharpness cannot be discerned on an image compressed like this, unless we talk about a striking difference, which I don't think this is the case here.
I have a PS4, I think that the PS4 version is not pushing the system at all... hopefully a better comparison with proper capture will let us see some subtle benefits to having a more powerful console (better shadows or AA) but this is entirely up to the developpers.