Focus was most certainly remastered, and bloody well, too. I'll spend more time with the original soon, but I do recall very clearly (before I knew what little I know now about mastering and production) that I thought it wasn't easy at all to hear what was going on. So much going on, and when I first heard it the sound seemed to not be open enough for what they were doing. I also couldn't hear the lower parts of the bass track, just the fills and things Malone did higher up. In the new one everything comes through clearly. There's also a message from Masvidal, more artwork and pictures, and a few bonus tracks (including an instrumental version of I'm But A Wave To..., which happens to be my favorite song on Focus). I'll pull up the old one whenever I find it.
I also can't help but wonder what the sound on the Death records (especially The Sound Of Perseverance) would have been like if there were more - and thicker - guitar tracks. I remember reading an article where Yngwie Malmsteen was asked about several songs without his knowing what they were, and some of his responses were quite amusing - he called a Jeff Beck song on being out of tune, said that John Petrucci should use a Fender vintage-style trem, and single coils (he did know who Petrucci was), and said that one of the Death songs - The Philosopher, I believe - sounded like it was recorded on a Tascam tape recorder while the vocalist was sitting on the toilet. For the record, I love Death, but I will say that while I'm not sure what the producer was trying to accomplish, I know that he chased a lot of people away from them with whatever he did to those poor tracks.
Jeff