Yes, it does make a difference...
to big power turbo cars. I'd be amazed if more than 2bhp of a difference was had in a full tank of V Power over any type of 95 Ron.
Plenty of motoring magazines and TV shows have done tests using rolling roads, different types of car and trying them with different fuels.
Comparing a 1.6 N/A Civic to a Big powered turbo'd Bentley is... laughable.
Although I don't put 95ron in my car as 99 is readily available near me, and while it may not improve performance, power wise, I do believe it can give the engine a good clean out, which is never a bad thing. I probably only do 400 miles a month, MAX. If my car was my daily, i'd be putting 95 in it to save money.