I have used Blizzaks on other cars over the years and I find them to be outstanding in the snow. Not run-flats though.
We had one snowstorm here and I back my car 1/2 out of the garage (rear wheels only) and almost couldn't get it back in so i would say stock Dunlop RFTs are terrible in the snow.
2012 135 Convertible
2010 Lexus RX350