Just to get you hankering for those remasters a little more, NPR's "All Songs Considered" blog shares observations on the spruced-up Sgt. Pepper. No sound samples with the story, unfortunately!
("She's Leaving Home")
Robin: You can hear the fingertips on the harp. This is a little like watching HDTV.
Bob: I was thinking that, too. Like plasma TV.
Robin: Listen to the falsetto harmonies. It reminds me a little of HD television in that HD reveals the flaws in people's faces. I feel like it's doing that a bit with this music, particularly in the vocals. It's not that they sound flawed. They just sound so naked. Those harmonies on this song have always sounded perfectly clear to me. But hearing it now, it's so clearly a group of guys singing in falsettos. The voices seem very naked. They sound human for the first time.