He got up so high he didn't even need to extend his arm. Looked like he got back there in plenty of time and the wall was built to accommodate scaling up. Impressive catch, no doubt. But not insanely good.
I definitely think the Edmonds catch is better. Making a catch over the shoulder running away is disorienting enough. To lay out while doing it is amazing. I've seen Sizemore make a couple similar catches. Those and the ones where the outfielder dives toward the field on a dead spring to catch a line drive are some of my favorites.
Willie Mays catch is probably the greatest catch WE HAVE ON FILM. Im sure there were great catches back in the day, and legend will tell you there were several great Willie grabs we never saw. But you are talking World Series, NOT NEEDING to dive, and the guy is going to a 483 foot Center field(where he catches it on the warning track a step from the wall. He was then able to wheel and get a pretty good throw back off to home. Maybe we're bored by that catch, but you can't even put Edmounds in the same universe.Personally, I think Griffey Jr.'s rookie year rob of Barfield is the best catch I've seen while playing. What impressed me there is, he was running full speed, ran, jumped and extended all in one motion(not waiting around for the ball). He also barely glances at the wall, it was like a supernatural catch to me.
I will say this, looking for video of that griffey grab, here is a pretty amazing grab in its own right: