I have replaced Bridgestone Turanza T005A with a set of these for this season. So far, I've driven them for about 3 months...
From my initial impressions, these tires have an amazing amount of grip in the dry. I was not unhappy with dry grip of the Turanzas, but these are signficantly better. In the wet, considering they are new and the tread is pretty fresh, they also grip well. Went through 2 situations with a heavy rain and I didn't really have to alter my driving much...
Regarding efficiency, these are not great compared to the Turanzas... I was able to occasionally get below 5.5 l/100 km with those, which is not happening with these new Hankooks. I'd consider that a tradeoff for the grip (can't have everything). The efficiency is not terrible though, I think my fuel consumption went up by a bit less than 10% (something like 0.4 l / 100km).
Comfort is fine. They're slightly stiffer than the Bridgestones, but not still acceptable... They seem to also be a bit noisier than the Bridgestones, but that might also be the car getting older...
Most of my driving happens on motorways and some backroads...

