I have had all three sets of irons, and the latest Vapors are fractionally better than the Level 97's. But, the Nikes, both sets are more accurate than the R11's, and so one can put full BS on most shots and still get the distance as quoted.
From the 6 iron down to the wedge you are going to lose a few (4 - 5 ) yards, and even get some spin on the green.
Top spin works especially on the 120 wedge, it can go up to 128 yards on a flat green like Beth #1.
Obviously the Nikes are easier to ding than the R11's so you will find you are getting the best and maximum out of the club more often.
I use level 92 Nikes mostly, but callaways work pretty good, just a bit quicker.