Not wanting to start a fight or anything Blu Ray discs oft suffer the same aggressive dynamic range compression as any other digital format, including CD, hi res downloads, SACD, whatever. Check it out on the Dynamic Range Database.
http://dr.loudness-war.info/album/list?artist=Beatles+&album=Abbey+Road
http://dr.loudness-war.info/album/list?artist=Beatles+&album=Abbey+Road