Here are a couple of links for you:
http://www.stereophile.com/cdplayers/704arcam/index5.html
http://www.enjoythemusic.com/Magazine/equipment/1003/arcamfmjcd33t.htm
The Stereophile article explains the differences. I could not find the review where the reviewer liked the 23 over the 33. I remember it was a woman though, not that that means anything...
http://www.stereophile.com/cdplayers/704arcam/index5.html
http://www.enjoythemusic.com/Magazine/equipment/1003/arcamfmjcd33t.htm
The Stereophile article explains the differences. I could not find the review where the reviewer liked the 23 over the 33. I remember it was a woman though, not that that means anything...