By background noise i mean white noise produced by the headphones when noise canceling is turned on. It was audible in the XM3 too but the level was low enough and not disturbing in my opinion.

I replaced my XM3s with XM4s and ended up being a bit disappointed as they have an annoying amount of background noise. The XM5s are not foldable so I didn’t even concider those. So my recommendation would be to look for something else.