The MacBook Pro Mid 2014 Retina has an 802.11a WiFi standard which is better than most MacBooks that have been on the market for around the same time as it. Most notebook PCs of this type and age have an 802.11n WiFi standard. In addition, this laptop have 802.11ac and 802.11b and 802.11g WiFi standards.
An 802.11a WiFi standard is in fact the worst Wi-Fi standard across all similar spec laptops that have been around for around the same time as the MacBook Pro Mid 2014 Retina.
The best Wi-Fi standard across similar types of laptop is 802.11n.