Everyone trumpets the glories of the 1976 Herbie / BPO performance but the Minority Report, penned by yours truly, says the following: this September 1971 recording of the Sixth is the best on the market. One advantage it enjoys over 1976 is the acoustic itself: it was recorded in the Jesus Christus Church rather than the dreaded Philharmonie; there is more air around the orchestra, and how well they play and staggeringly so. Oh, that's right: it comes with 4 and 5 which are lesser symphonies in every way. For what they're worth, they are exceedingly well played. Treat them as entrees to the main course of darkness.
There is a saying: anyone can stand on the edge of the Abyss and summon the spirits but will they come? In this performance of the Pathetique, they do: a dark plutonic god arises in development section of the first movement - a Devourer of Colour and Life. It's no wonder that one of Karajan's daughters once thought her father would die onstage during such a performance. Indeed, if you have experienced true grief, I urge you to stay away from this performance: it will enviscerate you further. You do not need it. I jest not.
From the Apocalypse of the First Movement to the Requiem in the last, this performance is fully equal to the score itself. This is not normal music making: it is a one-way ticket to the Underworld, the abode of Shades and Irreparable Loss.
PS - the booklet on page 2 categorically states that all three works were remastered in 2007.