I've been enjoying my CX for a few weeks now.
My impression is also "does this sound right?" coming from 6XX and Sundara.
They sound great, but there is some kind of weirdness to them.
I also understand why some people say they sound boring and flat, but I still like them... I think?
I really want a good pair of closed backs, ideally planars, and these should fit right in, plus I bought them used for 650 CAD
I've been experimenting with pads and I think I'll settle (for a while at least) with sheepskin pads for Denon headphones from Aliexpress.
They fit really well, are comfortable and have a smaller cavity like the originals, which makes the installation of the dampening filters just as convenient.
More importantly, they give a bit of a bass boost (still pretty neutral) and I think it makes the CX not boring anymore.
Plus, they are super cheap!
I bought these:
https://www.aliexpress.com/item/33040658281.html
They seem to be the same and are extremely cheap at the moment:
https://www.aliexpress.com/item/1005001853763568.html
They are worth a try!
I'd be curious to hear other opinions on how they affect the CX's sound and if someone feels they negatively affect the sound. I don't feel super competent at evaluating fairly subtle changes in sonic performance.