Well, I went ahead and baught the set on iTunes--it only just became available within the last 15 or so minutes. From the samples on iTunes, I am noticing more ambience...just from listening to the sixth, ninth and a little of the fifth. The sixth and ninth are the only ones I am very familiar with from this set, so I will report my findings on those recordings and leave critique of the others to people who know the works better.
Interestingly, the price of $44.99 on iTunes seems very good, and honestly I wonder how long it will stay like this. Amazon MP3 has the set for $40.64, and DG's Web Shop has it for $39.99, and that $39.99 is for FLAC lossless audio!