They say a picture is worth a thousand words, so...
Hamilton is by far a better driver than Vettel. If you cannot acknowledge that then you simply must have your head up your sphincter ani externus. Yet... Vettel was leading the championship all the way until Belgium. But then Ferrari made good gains from Belgium to Italy to be almost level. Then in Singapore, Malaysia and Japan, reliability (not outright speed/performance) let Ferrari down. So apart from the flash of Belgium, it was unreliability issues with Ferrari that has given Mercedes the WDC lead.
With a much better driver, Mercedes has not
convincingly lead the Ferrari all year until Ferrari imploded in Singapore. Fact is, Ferrari have the better race car, and have had the better
overall race package all year until they imploded in Singapore, Malaysia and then again Japan. If it wasn't for the unreliability issues, Ferrari would've possibly continued to out-develop the Mercedes, and still possibly be leading the WDC. The WCC is out of contention because they employed an average second driver in Raikkonen, just to keep Vettel happy. If Ferrari had a better second driver, they could well be leading the WCC too, because the car is good for it.