iPhone 6 Wifi AC Speed
According to http://www.apple.com/iphone-6/specs/, the iPhone 6 supports 802.11a/b/g/n/ac Wi‑Fi. So any router supporting the same standards should (and usually will) match your phone.

For potential speeds, see


http://www.macrumors.com/2014/10/01/iphone-6-wifi-compared-to-iphone-5s/
http://www.iclarified.com/44330/iphone-wifi-speed-test-80211ac-iphone-6-plus-vs-80211n-iphone-5s-video
http://www.iphonehacks.com/2014/09/iphone-6-plus-vs-iphone-6-vs-iphone-5s-speed-test.html


but keep in mind that maximal throughput depends on a lot of factors like packet/file size, router model, interference, distance between device and router etc.