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To clarify: if you're using a magnetic cable charger (not a dock) then it's not a Sony product, thus quality of charging will be variable and not of a standard quality. Sony only has the Magnetic Dock DK48 for Z3 series. I baught myself one of these magnetic cables and it charges my phone FASTER than regular dock when connected to the same adapter.
Bear in mind that chargong via magnetic chargers is dependent on the cleanliness of both charger and port. Any dust, rust, or residues on either of them can compromise the charging speed.