The Apple MacBook Pro Early 2015 Retina has an 802.11n wi-Fi standards which is better than most laptops of a comparable age and type to it. Most MacBooks that have been around for a similar time 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.
An 802.11n wi-Fi standards is in fact the best Wi-Fi standard amongst all similar spec laptops that have been available for around the same time as the MacBook Pro Early 2015 Retina.
The worst Wi-Fi standard amongst comparable types of notebook PC is 802.11a.