The Lenovo G50-45 has an 802.11n wi-Fi standards which is better than most laptops that are a comparable age to it. Most laptops of a similar spec and age to it have an 802.11b wi-Fi standards. In addition, this Lenovo laptop has an 802.11g wi-Fi standards.
An 802.11n wi-Fi standards is actually the best Wi-Fi standard across all portable PCs that are a comparable age to the G50-45.
The worst Wi-Fi standard across comparable types of portable PC is 802.11a.