I agree with the "third eye" guide that the solo violin sonata is played without feeling by Tetzlaff. For me, he doesn't reveal the beauty of III Melodia at all - contrast it with Pauk on Naxos, whose account of the Melodia is lovely and singing.
I've given three stars because the two performers work very well together on violin sonata 1, with Andsnes providing character, control and immaculate timing - Tetzlaff thrives on the partnership and a beautiful performance ensues. So worth buying for that alone. But if you are a bit disappointed by the solo performance, try Pauk.
P.S. Why is Andsnes's name smaller than Tetzlaff's on the cover?