I agree with DC here,framerate is bit wonky,probably between 20-30 fps,in the middle...
As for the LO comparison,as far as i remember LO looked really great in combat,not seeing much difference here,as for field,hq hd videos needed...
Leaving teh graphicz aside,the most unimportant thing in rpg for me,i don't think that this demo is anything different from others,sure it has great production values,but in the end it still has
Bunch of (in)visible barriers,no you can't go there,look there is a circle on the ground you can now jump,annoying "stomp stomp stomp" walking,running sound.
There is also one thing that i noticed the friendly AI is not following you as close as it can,it just waits until you cross some invisible barrier and then quickly goes to predetermined spot.
But in the end i liked the combat,the way it goes from field to combat,so i am satisfied with the demo.
As for the bigger less linear areas,full game will have it,no doubt.