Barenboim's tone is firm and has a good edge around it. It reminds me piano's sound comes from a hammer hitting a string - even when he plays softly. More punch and clarity compared to any other version. His interpretation is romantic and virtuosic. Berlin Phil's sound is rich and grand - exactly opposite of the historically informed performance practice. A little pompous but still top-notch. Perahia and Brendel both offer more intimate renditions. Especially Perahia's playing has everything you ever want for Mozart - lyrical, lively, tender, bittersweet......simply heart-stopping. If the recording quality was above average, his recordings would be undoubtedly my first choice. Brendel's playing is insightful and full of beautiful moments. But he tends to be too deliberate to create peculiar tones he wants and to deliver more legato.