I find the character of the album changes on the second disc. To me, the Disc 1 songs are very much the core identity of the album, they all have a particular feel to them. Disc 2 I do like, but it seems like the Disc 2 songs don't have as much in common with each other overall, or are in an order that isn't too flattering to individual songs other than Empire. I do think they've been put in that order for a reason, but you have two energetic songs, two slower, more emotional songs, and then it's a case of clearing the stage for Bruce's masterpiece. Man of Sorrows in particular loses out, I think, by coming after Tears of a Clown, and gets forgotten about by the time Empire of the Clouds is midway.
Starting Disc 2 with two livelier songs was quite impressive on first listen, with a gap between the two discs. It's almost like they felt obliged to do another opener, and then followed it up with an energetic second track (not unlike the idea of IESF followed by Speed of Light) to prove the point that they've managed to create a full-on album throughout. That left them with no choice but to do two calmer songs back to back. I suspect they didn't want anything too bold right before Empire, because that is meant to stand out as grandiose and theatrical, so they put an understated one there, which didn't do Man of Sorrows any favours, and means there's a comparatively sedate section to Disc 2. Rumour has it that there was other material that could have been recorded, but whether that didn't make the grade or just didn't fit we might not find out until the next album!
It definitely feels like there's more gravity to the first disc.