Which of the four times WDC is going to reach 5 WDC first?

[Nitrodaze]

IMHO, Vettel doesn't stand a real chance in Ferrari until the FIA forces a major power unit change. Merc. in the hands of Hamilton is simply too dominant.

I don't think Ferrari want the current hybrid power unit to change very much. Besides, the Ferrari engine is equally as powerful as the Mercedes engine. The real differences are in the chassis, reliability and race strategy. The Mercedes had a poor chassis compared to the Ferrari this year but made up for it with great reliability and made no mistakes on race weekends. Ferrari had the better chassis but had poorer reliability and both driver [Vettel] and team made a number of costly mistakes.
I think if you swap the cars between the two teams; i.e. give Mercedes the Ferrari chassis and Ferrari the Mercedes chassis, Mercedes would have won the constructors championship by a country mile and Hamilton would have also won the WDC in the Ferrari chassis.