The Lenovo Z500 has a better Wi-Fi standard than most notebook PCs of this type and age. This portable PC has an 802.11n wi-Fi standards, whereas most laptops of this spec and age have an 802.11b wi-Fi standards. This notebook PC also has an 802.11g wi-Fi standards.
This laptop's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard across all portable PCs that were released around the same time as the Z500.
The worst Wi-Fi standard across comparable types of laptop is 802.11a.