There was a big deal over the CD release in 1987 because CDs hadn't been around that long, but mainly because it was billed as a big thing because it was released 'twenty years ago today'. I remember reading among all the media hype at the time that they wanted to do a really good job of transferring it to digital, partly because it's widely considered as the Beatles' finest album, and they certainly succeeded. The sound clarity is fantastic, and the 'pop' sound is very clear through my speakers. In the animal noises at the end of Good Morning, the crackles of the record they were taken from are also audible. On the cassette I had of it previously the crackles couldn't be heard at all.