There is not a coincidence that here 6 cars from top 10 are with a Ferrari PU (not the engine ... I`ll explain that later):
And here are 5 arguments why Ferrari PU now is more powerful than the Merc one:
1. Cr.Horner`s statement;
2. Niky Lauda said on Sky that Ferrari are faster both on the straights and in the corners;
3. Nico Rosberg said on RTL that after 5 years Ferrari PU is ahead due to they have found something at the ERS side;
4. Lewis said that in Q3 Ferrari pulled out something extra out of the bag;
5. Between Q2 and Q3, Kimi raised his top speed from 323 to 325km/h and Vettel from 321 to 324km/h
Merc team did the same top speeds in all qualy sessions so it seems to me that they are in those 2-3 races when they`ll run in conservative PU modes until they are satisfied by the reliability ...