well, yes and no - you're right that the mastering should be right and the music should be ready. But mastering engineers, in my experience, often have not a clue about music of this vintage. But as long as they have not changed the wave form (with digital noise reduction) a lot of compensation can be made with a good eq. Best example I can give of this is the old BMG Jelly Roll Morton box, which was roundly castigated when it was released some years ago for sounding dead - everybody blamed "no noise" but that had nothing to do with it, as that system did relatively little at the time it was appplied. I've been able to take that box and make it sound absolutely brilliant (I surprised none other than Larry Gushee with this), but I was somewhat shocked at how much eq'ing that had to be done - but once again, you're right that the sound should be CD ready - on the other hand, if the original sources and transfers were right (as they were with Jelly Roll) than it's worth a little extra effort, especially since, with Sony (as with BMG) you're likely getting originals.