I would just like to point out a couple things in my humble views of CD players.
I bleieve the most important aspect of a CD player is the transport beyond all else. It seems as if the 30lb CD players play forever and will play the most destroyed thrashed discs exellently where a normal player would start to skip consistently it just politely passes through the content ever so perfectly that your bummed but you can still play a couple forever lost songs.
It is for this reason that you will see the auction of the denon 1650 is pretty hot right now (its not my item but i like the 1650, SCD-777ES, and the Marantz SA14 for transport/SACD value minus the 1650).
They seem to me to be mostly like a receiver. The amplification is the same just new processing or video conversion, YOU NEED A NEW UNIT!!!, It personally makes more sense to go with a new DAC every 3 or 4 years that you buy one or 2 years old (Im 26 and on a tight budget) so you are never stuck with a beautiful box with a worthless chip in it.
As far as pro gear goes. There are a few huge things to be factored in.
1. A studio should have the cleanest form of AC available
2. It seems all of the equalization is done in the digital realm so they would really only need a rock solid transport to feed a digital signal to there boards, or a rock solid recorder to record the digital signal which would have nothing to do with digital to analog conversion and once again only transport and digital feed I assume.
3. The CD player will never ever sound anywhere near as good as the original disc. I believe they record hundreds of discs at a time in series, the first cd recorder should sound better than the second and third and so on by that logic. What it will allow you is a few parts they were only able to offer in a more high end model a few years ago or brand new parts they have just created.
I am not an expert it is first assumption on the topic and it is just what makes the most sense to me. Also these are statements from someone on a budget. Im curious to see what other responses come up