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Hi Nick_S,
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In this situation you are best to speak with Sony Mobile within your region.
In some cases sound related to the camera cannot be removed for privacy reasons for that country.
Use my signature to find details for Sony Mobile within your region.
If you want to flash your phone
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459
this is very basic.. but sometimes ignored by me.. 
The sound through quick launch is there and you can't disable it, even with different firmwares
Actually it would be better off that quick launch button the way it is now. I have a Z3 Compact and every time I take it from the table or pocket or whatever I take pictures to the floor walls sky ceiling whatever captures without knowing it. When you take the phone in your hands it's hard to put the fingers in the free buttons area. That button should be less touchable avoiding involuntary pictures. Just a suggestion.
Sony engineers are
Who puts a chime there
Privacy is a nonsense as i can go to camera via main menu without the chime
Apple and Samsung don't have a chime