I have found the ratio to be much higher.
Unfortunately I find that "poor" mastering exists on almost all non-jazz and classical releases from the last several years. I first became aware of this about five years ago when I would rip a track into an audio editing program and find that there was essentially no dynamic range to it. I've also seen that some "remastered" discs are just "remastered" with more compression (apparent loudness) than the originals, not a better mix or cleaner mastering.
I'm finding it ironic that as I start to experiment with vinyl in the coming week, I'm likely to find the higher dynamic range on the "inferior"(read: Lower S/N) medium because the higher available dynamic range of CDs is not being utilized by the final engineers.
