I think PC and PS4 will be very close for the next couple years (2014, 2015). Why will they be close when the PC is has better specs? Because studios tend to code for the more popular platform which can be expected to be the new console (It's always been this way). Even the highest spec PC's are only double the power (twice the bandwidth and twice the flops) of PS4. That sounds like a lot but because of diminishing returns it would only be perceived as a 20% increase in visuals. And the PS4 will allow you to code "to the metal" unlike PC's so the gap will be much closer than raw specs would have you believe. And most importantly, Sony 1st party studios will likely outspend everyone else in development costs and a big part of graphics is art design which is excellent from these studios. Once again I think it will be close with PC having an edge in most multi-platform games while some stand out titles for PS4 will be a cut above due to custom tailoring, innovating graphical techniques, animation techniques and great artistry.
