Interesting choices and after hearing the tracks more outside the game, I also have do admit that the whole soundtrack is very good. While playing, I was often distracted by the game and couldn't enjoy the music besides the really outstanding tracks, which decreased my initial opinion of the OST a bit.
Where I absolutely disagree is with choral chambers. The reverbing echo of the halls make it sound so strong and in the OST version it is worse than in game in my opinion.