Only advantage apart from sales!
Like most people, I don't have shares in Sony (or MS) so whether they shift 2 million units, 4 million units or 400 million units doesn't really affect me. People are far too bothered about the financial success of these massive corporations that would gladly throw you beneath a bus if it was profitable for them.
Also, for a games console I would say superior image quality was a pretty important advantage to have!
Sure it is, but it's not the only thing that matters despite what so many seem to believe.
Shall we ignore the additional FPS and graphical effects in a lot of multi plats then?
In a thread about the Xbox One going Kinectless? Yes.