Docomo have announced the phone models that will be getting the Android 6.0 upgrade. The Sharp-made phones are:
The SH-01H and SH-02H OS version up rolled out on 21st June 2016. The SH-03G upgrade began on 8th August 2016. Source.
No Sharp phones currently released on Softbank will be receiving the upgrade. Source.
On AU KDDI, only the AQUOS SERIE SHV32 will get the Marshmallow Android (3rd August 2016). Source.