It is this very subject that brought me to this forum and it has been very enlightening.
The only symphonic cycle I had ever owned up to this time was Christoph von Dohnanyi, The Cleveland Orchestra, 1989, Telarc. The disc containing the ninth had a continuous low-level hum throughout, so was unfit to play. I replaced this with a single by Lorin Maazel, The Cleveland Orchestra, 1979, CBS Masterworks.
You get used to what you have, and I always thought these works sounded good on my gear, but I was willing to go in search of a more recent work that would hold promise of being superior sonically -- as in modern recording methods, direct to digital, and so forth.
So I went for the Chailly, in part also because I was aware of the metronome markings debate and I was very curious about that. It is, to say the least, interesting. But, as someone else has remarked here, it's much like sightseeing from a race car. As I say, you get used to what you have. It's hard to have something you love changed like that.
It isn't clear to me yet that this Chailly recording is superior to my older discs. I need to spend more time with it, perhaps. I am going to purchase another round of these works after further study of the posts in this thread. It is difficult to know what to try next. I believe that what I want is rendition to which I have become accustomed with better presence and dynamic range.