I use an HDMI cable and the quality on my pS3 is nothing compared to the PS4.
And defintely WAY fewer NPCs. You know that whole scene when you walk out of your house the first time, and like half of Haven is standing there assembled before you at the beginning?
On my ps3 playthrough almost NONE of those people were there. Only 2 or three standing among the houses way of to the side. None of the columns of people. And it just continued from there.
More people in Haven. More people in Redcliffe and the crossroads, more people in Skyhold, more people in your camps...and I'm talking like twice the number of people. A huge difference.
So I can absolutely see how if it wasn't integral to the plot, and was going to not work on a last gen port, they might have scrapped it.