Even IF Vettels RB7 had more ultimate speed potential(and who would bet against this) ,we will not know how much the combo would have been able to extract if pushed harder by the opposition.
so the discussion is academic and we will only ever know when opponents get their act together.
to me Hamilton should have dived into the pits together with Vettel in the hope to retain the gap as it was and see what can be done with it (vettel in need to push harder).You can clearly see in the overlay that Vettel stopped immediatedly
when his tyres were giving up.Hamilton could go on a bit further but had the same
giveup with delay.Had he done it paralell you can see from the graph that speedwise they wer equal after the stop ,maybe Hamilton -with damaged car!) even more consistant.
After all Hamilton was in need of having to push harder and his car cried enough
even though it was surprising it did not disintegrate more given Hamilton did not really nurse it.