The MacBook Pro Early 2015 has an 802.11n WiFi standard which is better than most MacBooks that came out around the same time as it. Most portable PCs that were released one year ago have an 802.11a WiFi standard. In addition, this portable PC have 802.11ac and 802.11b and 802.11g WiFi standards.
This laptop's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all MacBooks that are a comparable age to the MacBook Pro Early 2015.
An 802.11a WiFi standard is the worst Wi-Fi standard across comparable types of laptop.