Well, i think i will return the xm4 - i am disappointed
I compared it with my QC35
the QC35 fits to my ear perfekt
the XM4 touches my ears, which is not a good fit for me - i habe no big ears, but to big for XM4
never had this problem with a Bose.
ambient sound is not any useful for me - i want to have no NC or full NC - cannot turn it on and of via button, only toogle (on, ambient, off) which is a pain.
on turning louder via touching i would prefer a higer tone, for less volume a lower tone.
why did sony not make two different tones for louder and quieter - a already reported this to sony on testing the xm3
using the NC, the sony has less ground noise level if playing no music
i do not think, it is a broken unit - sony seems to have a rather high signal noise by turning on the NC
i will continue testing for some days, but i think, i will return the XM4
there is very little new innovation compared to XM3, so it is a XM3.5 and not really a XM4 for me.
users from XM3 do not need to change, except they need 2 bluetoothconnections
NC of XM4 is very good, but only minimal better compared to previous versions - no big step
for really loud environments, i prefer X5A
maybe i get used to it after some days - time will show
one bug on iOS
headphone app shows no headphone-connection, but spotify is playing on headphone
curious
second bug
use the XM4 for telefone call, the other person does hardly understand me - switching to iphone micro, understand is fine - so must be a problem with telephone calls using latest firmware 2.0.6
EDIT
did some more telephone call testing
Bose QC35 has much better quality in a quiet room
XM4 is always interruped for some milliseconds and sounds.
i did several cross checks - always the same result
maybe a bluetooth problem or a microphone problem with 2.0.6 or anything else
i send the wh-1000-xm4 back
i am not interested in waiting for a new firmware and testings all different possibility's
sorry, that i have no better information