I'm only thinking about the TS3 or Ke4 Max. I would only be looking for more spin. My TS2 irons are so forgiving, it's crazy. Plus they go nicely high and long for my feeble swing. Maybe I don't try enough irons to know better.
But if I could keep the height, 90% of the forgiveness, 98% of the distance, and get enough extra spin to notice, then I'm interested in new ones.