The Lenovo T440 has an 802.11n WiFi standard which is better than most laptops of a comparable age and type to it. Most laptops of this type and age have an 802.11b WiFi standard. This Lenovo notebook PC also have 802.11a and 802.11ac and 802.11g WiFi standards.
An 802.11n WiFi standard is in fact the best Wi-Fi standard across all laptops of this type and age.
The worst Wi-Fi standard amongst comparable types of notebook PC is 802.11a.