What is the best sounding Mahler symphony cycle?

@mahler123, I agree with your impression. He’s not much of a Mahlerian. It sounds restrained and never really peaks.
I’ve been listening on Qobuz, most recently #6 which I would call dull.
Superior quality recordings on the RCO label. I need to have a listen to other recordings in their catalogue.

I have the Jansons 5.  I am not a fan of 5, and don't listen much.  The Jansons is my favorite of those I own.  It is a beautiful recording and adequate performance I suppose, but take that with a grain of salt since 5 is near the bottom of my Mahler list.  I bought it based on a favorable review, but I don't recall who reviewed it. 

Brownsfan,

Just curious,
What are your favorites?

I would recommend Bernard Haitink & the RCO for Mahler 7 & 9, and the Philharmonia with Lorin Maazel for Mahler 5. I’ve noticed that in some of the Philharmonia’s more recent recordings there is an increased presence in the lower winds and brass. This particularly shines through in the fourth movement of Berlioz’s Symphonie Fantastique with Esa-Pekka Salonen. 

Also, the Gergiev/LSO cycle may not be the absolute best, but it is one of the most consistently good Mahler cycles right now.