Everybody who has the OC score,
I encourage you to study this. Analyze it. Play it. Practice it. Whatever. I have, and have started to truly realize the greatness of this piece, and the genius of the composer. Absolutely amazing. If only you could see what he does! Take this for instance - you know the two themes introduced in the first movement, right? Did you know that he uses those in practically every movement? Sometimes it's very subtle, but you can still find it (maybe not by the recordings, though).
I am very anxious to hear a recording by Jonathan Powell. I created a topic on The Sorabji Group on Yahoo, and he responded, so I might ask him if he plans to come out with one. I have also communicated via Internet with Alistair Hinton on several ocassions. It is very interesting to talk with them. I can probably learn a lot.