When i was a leakage hooker with no compression i could still get a 9 iron to go 135-145 with not much issue.
As i learned G.O.L.F. at first, the distance was about the same or possibly a little shorter because i didn't have the confidence yet and swung a little slower.
Now my normal 9 iron goes the same distance as before but i have a bunch in reserve
. Plus my technique is much better therefore my accuracy has improved as well.
I'd say i've seen most of my distance gains in the 5 iron on down.