http://hisonvinyl.com/
Being so new there is not a lot on the site yet, but you can register yourself and help it grow to become more and more useful.
From the site:
"How It Sounds On Vinyl is the first and only database website dedicated to document the sound quality (SQ) of vinyl records. A vinyl record buying/collecting guide for all vinyl lovers, vinyl nuts, or just an occasional vinyl record buyer.
How It Sounds On Vinyl is a one stop spot for all vinyl record buyers to quickly find out the SQ of a vinyl release. Although we do compare different releases of the same albums, our main objective is to provide informations to help vinyl buyers purchase good sounding records, and to avoid spending money on the dud ones. How It Sounds On Vinyl is NOT a music review website."