Tried many chargers to power my Raspberry Pi (notoriously picky with power units). Measured the voltage over the TP pins on the Pi. The voltages ranged from 5.00V (Nokia AC-50E) to 4.75V (Sony XZ charger). Only the Sony charger manages to power the Pi without reboots and crashes, despite the lower voltage.
Both the Nokia and the Sony are made in China by Salcomp. Both are rated 1.5A. I guess they are identical on the inside. I am now charging my XZ with the Nokia charger and running my Pi with the Sony charger.
E: The Sony charger never had any problems charging my phone.
Moto Flare - 2110i - 6110 - 8850 - 3300 - 6170 - 5100 - N70 - 5500S - 5800XM - iP4 - SGS - SGS2 - Xperia Z