Hi opinionista,
I could be very wrong about this idea that there are details in the full screen that we don't see in the widescreen (since I've not seen a full screen version). But, here and there people have said that you can see more of Ennis's body and his wedding ring more clearly in the motel. They say that it's easier to see exactly how he's stroking Jack's arm, etc. I truly can't remember where this has come up, but I'm sure I've read it more than once. I'm guessing that any such additional details would be quite small and subtle. I think people have said that the first tent scene comes across very differently in the full screen too. But, again, I'm not sure. This is why I want to know if it would be worth having both versions.