Each and every test of the gen 2 had it outperforming the gen 1 (stock bike to stock bike).yes, I'm convinced all generations will be very similar in performance. comes down to the rider for sure. I thought that since the gen 1 is only 1299 cc and 11:1 compression that there would be a very noticeable performance difference to the 1340 12.5:1 ....but not really. maybe 5% or so, but then again my gen 2 is lighter, full exhaust and the ECU is flashed so that could be that 5% increase. again this is just my "butt dyno" nothing official here ....either way the gen1 does not disappoint.
We have already seen some testing of the gen 3 outperforming the gen 2 in mid range delivery....
I reckon by the time the gen 3 gets to speed, the little bit of extra power the gen 2 has will be negligible to catch it.
Once the mods come into play, all bets are off as to which generation will outperform the other. The gen 3 should still have the edge as it's electronic suite will allow the power to be used more efficiently and get more of it to the ground.