Eeeerrr......F1 tyres consist of 50 different blends of rubber compound (on a single tyre!) and only work when they reach 49 Celcius. Comparing F1 tyres to consumer tyres are like apples and oranges.....not the same thing at all.
In my personal experience, Bridgestone has never made a good strret tyre. Don't bombard me, just my own experience. The only good tyres frm Bridgestone are frm the SO-* range........and we all know what these cost!