Might it be the extreme chromatic aberration? I once read an article saying how to achieve 'photorealism' in computer graphics, one should add chromatic aberration, as that's what camera lenses naturally produce. I think some people take it too far though!
No lenses except the cheapest Chinese ones made for CCTV cameras exhibit noticeable chromatic aberrations. It's really annoying it's being pushed in video games so much lately.
