My copy of Bookends (my favorite of the duo's albums) is a 2-eye Columbia, and sounds good enough. My Bridge Over Troubled Waters is the Classic Records 1999 reissue, and sounds real good.
I myself prefer Paul's first two solo albums to any of the duo's, and those sound pretty amazing. I have his first in a UK pressing, the second a US, and both in reissues mastered by Steve Hoffman and released by DCC. The musicianship on the second (There Goes Rhymin' Simon) is absolutely spectacular. The players are the legendary Swampers, formerly the house band at Fame Studios in Muscle Shoals. They are also the band on Boz Scaggs debut, and all the Jerry Wexler-produced Aretha Franklin and Wilson Pickett albums. Jim Keltner said in an interview that he wished he played drums more like The Swamper's Roger Hawkins does. Don't we all?