I'm looking at it on my phone. But I also owned both versions. I'm seeing a higher resolution and slightly higher textures. Nothing drastic.
Edit: Maybe I'm focussing too much on the environment. The characters certainly look much better.
Take a look on a PC sometime, if you get a chance. It's night and day. One image is fuzzy, the other sharp and clear -- characters, environment, everything. I don't know about textures, but the overall image is very much improved. Anyone saying that there is no significant difference is suffering from self disillusionment.