If possible, not only get docomo one, but also can get the LG microusb cable (shipped with models from G2 onwards), it's currently ranked no. 1 as a general cable unofficially according to the tests done by some forumers in Taiwan.
They used some devices to check the voltage at the input of the cable and output of the cable and then give the voltage drop per unit length.
Currently this cable has the best score, followed by the docomo one which is already very very good. But of course docomo is longer and has the 2 ferrite beads at both ends, while LG one is just normal cable.
These two cables are considered the 20AWG ones. Samsung original cable is at 23AWG. The lower the number, the higher the current it is able to carry across.