Looking at this comparison (which seems closer to a correct "maxed" PC one -- sadly I don't have the game to take a screenshot on my own and make sure), I'd say that the major differences are
- Significantly more crisp pixel-scale detail on the PC version, especially concerning specular highlights (e.g. with the blood splatter on her forehead).
- Higher hair strand density on PC.
- Softer DoF on PC, which is generally more expensive.
- Different light intensity, either by artistic choice, varying HDR resolve, different capture methods, or a combination of those.