I rent this clubs in free wekend rent and see a difference in mapping vs PingG25 with same balls (Srixon Lv 11) and same wind (+1) in Kiawah.
Distance in Calla Lv85 Iron 5 (190) is +2.5% with NoSpin (MidSpin, really)
This plus is decreasing exponentielly until PW when is practically imperceptible.
May be precision have something here, but guess that .5 spin difference is a determining factor, and if i'm right, that affect really more in tailwind and headwind.
I have to said I expected more from the H3 (220) than in the tests gave me just an average of 203 (Carry) + 24 (Roll) with MidSpin, I must try it more to see if I can get used to those long shots where my W3 85 - 90% is making a decent job yet.
Anyway, I think that this Lv85 irons is a "Must to Have" since getting from here to Lv97 are like two years at my pace ...