Guys I think part of the answer is in the current Feb/Mar 2005 TAS issue on page 92 RE "Dynamic Compression and the Loudness Race".
With CDs being mixed louder and louder to out match the competition on the radio, dynamic compression is applied - chopping musical peaks and raising the average loudness.
LPs doesn't have this issue, cannot be mixed too loud or the stylus will jump out of the groove. And with classical, we all know that the dynamic range required to capture a full orchestra is certainly very wide, so I surmise that engineers have had to lower the recording levels for classical music. Unfortunately, with such low levels, its just above the level of record surface noise, which does get in the way.
As to whether CDs sound superior to LPs, except for the occassional tic and pop, how can CDs ever sound better than an LP of the same recording with all this dynamic compression (unless the LP record engineers made a mess of the mix) is simply beyond me. Though I would concede that CDs have improved and are bridging the gap.
I also agree with TLH, a good phono makes a world of a difference.