[aerobod]

Direct quantitative comparisons don’t seem to be available from my brief search, but I did find Tirerack tests of the Michelin Pilot Sport PS2 in ZP (run-flat) and standard (non run-flat) form performed at the same time of year on the same car (E92 328i) and the same size (225/45-17), with the following results:

Dry braking: RFT - 89.4’; non-RFT - 86.7’ (3% difference)
Wet braking: RFT - 112.1’; non-RFT - 111.8’ (0.3% difference)
Dry cornering: RFT - 0.89g; non-RFT - 0.98g (10% difference)
Wet cornering: RFT - 0.73g; non-RFT - 0.74g (1.4% difference)

The biggest difference is when the dry tread has to comply to the surface the most, under hard cornering.