These works are indeed profound, so much so that even a performer like Andras Schiff, now almost 50 years of age, hardly feels ready to approach them.
Kempf here displays a wonderfully acomplished piano technique but, at the same time, lacks any deep and convincing affinity with the psychology of the pieces and, at times, betrays signs of a lack of commitment, even flippancy.
Take, for example, the start of op.109, is it really in keeping with the character of the piece to treat the broken chord linking the opening flourish with the preceeding slower mood with such youthful, careless abandon?
And, doesn't the phrasing of this ensuing section just reek of Academy-boy-itis? Surely Beethoven here asks for a soul searching flow rather than a jigsaw of stops and starts?
Anyway, despite Kempf's shortcomings, in him we have a great talent (see his Schumann and Chopin disks), and one which can only improve with age.