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WirelessHART, the first international industrial wireless standard (IEC 62591), is built on top of the IEEE 802.15.4 standard. Both standards have progressed since the WirelessHART incarnation. WirelessHART has gone through a major release, added support for discrete devices, and lately turned attention to wireless control. While WirelessHART is still based on IEEE 802.15.4-2003, IEEE 802.15.4 has progress to the latest version of IEEE 802.15.4e, with lots of new features that used to be exclusively in WirelessHART. In this paper we study the relationship between these two international standards. We look at how WirelessHART influenced IEEE 802.15.4e, what impact the latest IEEE 802.15.4e has on wirelessHART, how people could benefit from both standards, and what the future holds for us.