What they did is amazing. The video is clearly been reencoded, it looks like a 1080p BR upscaled in 4K, it's a massive improvement over the 360 version. Otherwise, in game it looks pretty sharp and clean. The only thing is the UI, it's a little blurry but it's OK. I have yet to try XIII-2 and LR.
Hoping Lightning Returns goes in sale for Black Friday, as it’s the only one I don’t own, but if the price is right I might just pick up the entire trilogy digitally and World of FF as a way to show Square my appreciation.