We can observed since a few races, that Williams BMW was as good as Ferrari and may be just a bit ahead but however Ferrari has an advantage yet, Michael Schumacher and Even Bridgestone is not as good as Michelin, the partnership with ferrari is an ad for this Team because ferrari is the only top team equiped with bridgetone and if we can see at each race that Michelin has 8 drivers equiped with their tyres 'cause 3 top team out of 4 are equiped with Michelin and just Ferrai with Bridgestone, thus it's not very amazing to see 8 drivers out of 10 in the top 10. I reckon that Williams BMW is the most dangerous team to Ferrari bacause this one is just 3 points behind Ferrari at the Constructors championship. And I expect that ferrari will keep the head until the end of the season .