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If I'd go to Crawl -> Sitemaps section there will be a list of sitemaps with the number of total pages in each one and the number of indexed pages indicated.
However I didn't see any way of finding out which pages of the sitemap actually indexed.
Of course I could use Google search with keyword "site:mysite.com" to have a look at the list of indexed pages but there will be no correlation to the sitemap. I will not be able to do any analysis of reasons the pages are not in index.
There is no list of "indexed pages" anywhere in Google Webmaster Tools. GWT will give you the count of indexed pages, but no list.
I believe that the only way you can get a list of pages that Google has indexed it so search on Google for site:example.com then page through the search results. Even then, it is not a complete list of indexed pages. Google purposely makes site: results somewhat inaccurate.
ThompsonPaul wrote on moz.com about figuring out which pages are not indexed. His post is worth reading because he suggests more advanced techniques such as a bookmarklet that makes copying the pages out of the results pages easier.