I think generally speaking, it is safe to say there are more non ES S10s since we are now only entering the 3rd year of the ES, but the non ES models have been being produced and sold for twice as long.
What would be interesting to know, out of curiosity and for future projections, is for the 2014-2016 model years, what percentages of S10s sold were ESvs non ES. I would be surprised if Yamaha didn't have that sale data captured somewhere. The fact that Yamaha continues to offer non ES versions on both the S10, and not into the fourth year of the FJR, tells me that market demand of the non ES models is high enough to maintain two versions (at least 45-65% sales split from one model to the other?).