Ahhhh...I wasn't sure. It's been years since I've seen anything other than the "enhanced" versions.
Just finished watching the 2.0 version of Episode IV, and was absolutely blown away. It was like finding something I thought I'd lost.
I didn't notice one minor thing, and I'm sure it has been posted before, but in the lightsaber duel between Vader and Kenobi the lightsaber effects go in and out, and they are completely gone in the scene where Vader walks towards the closing blast door. It looks like he is hold a fencing foil.