I was browsing using Google to find those references you gave (search: Do All CD Players Sound the Same) and came across this wonderful link:
http://www.whathifi.com/newsMainTemplate.asp?storyID=29&newssectionID=3
Titled 'Sound Advice', it is written by those knowledgable people at
What Hi-Fi? (from the writers who gave us DAC break-in).
'...what's going on? Digits are either there or not, right? The answer to that is 'kind of...' since all digital systems rely on error correction to get the sound from the disc to the analogue outputs in a recognisable form. The less hard the correction systems are having to work to reconstitute the original sound, the better the reproduction becomes...No, all digital equipment doesn't sound the same, however much logic might suggest otherwise -
in fact, it's a miracle most of it is so consistent... '