I didn't, actually.. the server at screenshotcomparison.com was down, so the link didn't work.
I prefer the left image, actually. It looks more like what actual grass and trees look like. The right one looks like it's had the Fellowship Filter applied to it.
The only part that bugs me about this set is the inclusion of the fourth film. And not for the crybaby reasons that others have brought up, but simply because I already own it. Do I get any kind of credit for this? An exchange? Ten bucks off the set? None of the above. I really hate double-dipping on principle, and this is just a slap in the face, making me buy a second, exact copy of a disc I already own. Really poor form, Paramount.
So I guess I'll have to wait until the inevitable release of the three films separately.
Welcome to Rivendell, Mister Anderson.