Yeah, but removing the letterboxing would mean reencodig the source yet again, which I don't want to do because with my computer I just can't work with lossless video. I'll have to see what I'll be able to do about it, maybe, when encoding the DVD files...
And yeah, I already further adjusted the unmasking scene after the workprint and made the contrast levels closer, so now it shouldn't be very noticeable but the GKAR quality is still lower than the 2004 and I that's also why I don't want to use GKAR for the whole scene.
Also keep in mind that (sadly) the different sources are much more noticeable in the DVD than in the workprint, because of the compression, so you can't really judge that based on the workprint.