The Lenovo Z500 has an 802.11n WiFi standard which is better than most notebook PCs that have been around for more than two years. Most laptops of a comparable age and type to it have an 802.11b WiFi standard. In addition, this portable PC has an 802.11g WiFi standard.
This notebook PC's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all laptops of a comparable age and spec to the Z500.
The worst Wi-Fi standard across similar types of notebook PC is 802.11a.