The MacBook Pro Early 2015 has an 802.11n wi-Fi standards which is better than most portable PCs that have been around for around the same time as it. Most notebook PCs of a comparable age and spec to it have an 802.11a wi-Fi standards. This notebook PC also have 802.11ac and 802.11b and 802.11g wi-Fi standardss.
This notebook PC's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all MacBooks that have been available for around the same time as the MacBook Pro Early 2015.
The worst Wi-Fi standard amongst comparable types of notebook PC is 802.11a.