Wikipedia in French, and Wikipedia in German are very good. They have each of them the third of the articles of the English Wikipedia (in 2012, source: http://royal.pingdom.com/2012/06/13/the-biggest-and-busiest-... ). Note also that the German Wikipedia had as many edits as the English ones, with fewer articles, which could be a good indicator of the (good) quality of the German Wikipedia.
More generally, there are plenty of very high quality websites in other languages than English on the Internet.
More generally, there are plenty of very high quality websites in other languages than English on the Internet.