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Not perfect, but wikimedia scores a respectable A on ssllabs:

Same IP as en.wikipedia.org, so does that mean they're using SNI to serve different certs? http://caniuse.com/#search=sni

Nope, it's a wildcard cert -- if you view the cert contents you see that the subject includes

CN = *.wikipedia.org

Actually, it's a bit more complicated than that. We don't just serve .wikipedia.org from our frontends, but also e.g. .wikisource.org etc.

So yes, we are using SNI but for wildcart certs :)