Well Corno,i must say i am not a big fan of Karajan,i always thought him to be too polished for my tastes.Efficiency is not everything -to me nearly nothing- in sound.I prefer Jochum's Bruckner to his.For the magnificent 2nd movement of this symphony Furtwaengler of course despite mono sound unsurpassable.For the whole of the symphony i favour Böhm.He has a studio version which is hard to find but worth all effort you will give to find it
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Rachmaniniov 2nd piano concerto.Leif Ove Andsnes soloist wiht Berliner Philharmoniker conducted by Antonio Pappano.Pappano's conducting is light and vivacious as always good accompanying,Andsnes is fast but accurate,noble but intense and emotional.He is very good as but he lacks the unique stamp and character that would make him great.