Landing pages, a new section of Google AdWords, contains a lot of information on the effectiveness of landing pages in ads. It also shows whether a page is mobile-friendly.
In the analytics section, you can find data about a landing address, mobile-friendly click rate as well as KPI (pay-per-click, conversion and others).
The page presents a report on an efficiency coefficient of landing websites URL, including those hidden in ads. The information has been collected since August 1, although it is still unavailable up to now.
Non-mobile-friendly pages will show a lower efficiency coefficient. The section has a function of pages testing on mobile phones.
Go to AdWords Assistance in order to know more details.