I agree with everything said in the Amazon review. Karajan's 1947 German Requiem is a sonic miracle, really--despite its age and the wretched conditions in Vienna two years after the war, one hears everything in the chorus, the orchestral sound has weight annd impact, and the soloists are unsurpassed. That reading was a fervent document from survivors of mass catastrophe, a moving assurance that music would outlive polotics and suffering.
This is Karajan's first stereo Requiem, I believe, and it updates the older reading with almost equally good soloists. Karajan is not slick or glib here, and I find his polished approach (which became too polished on his later German Requiem for DG) as valid as Kelmperer's on his classic 1961 recording, also for EMI (that set suffers from microphone overload at climaxes, which may or may not be significant to listerners today.) But as the Amazon reviewer says, even this excellent reading cannot duplicate the spiritual fervor and deep emotionality of Karajan's first post-war recording. I treasure both in their own ways.