I frequently use the charging dock for my Z3C and I even got a magnetic cable for it. But there's just no way of using the phone comfortably without getting the cable disconnected. I end up using the USB cable directly. The external USB port on the Z5C is a godsend.
Anyway any Z5 user having adaptive brightness bug? Each time you unlock your phone, the display will adjust to the right brightness. In doing so, the blacks on the screen become somewhat washed out grey colour?
Used to have this problem on the Z3C and now it's still present on the Z5C
I believe its a measure to improve readability in very harsh lighting conditions. My Lumia does it with the option of sunkight readability turned on