Just finished the JMT as well, and saw a decent amount of UL gear. Saw a 3-4 granite gears, a bunch of osprey exos, a GG mariposa and G4. ULA was the biggest presence...packs ranging as far back as the p-1 p-2 line, all the way up to modern catalysts with their new cordura bottoms. Counting my own ULA pack, I probably saw at least 10 of them.
In terms of shelters, I Saw a GG the one shelter, a lunar duo, a gatewood cape, a TT rainbow, TT cloudburst, a TT moment, a couple hammocks, a couple of fly creeks. TT was definitely the biggest cottage presence on the JMT while I was there.
I Didn't see any cuben...I heard from another hiker that there was a zpacks on the trail.
Also saw a guy with a golite jam doing the trail in a week...amazing. Overall, a larger lightweight presence than I expected.
Francis when were you on the trail and when did you hit whitney? We might have barely missed each other. I started the 5th, and finished the 25th. I hear you about all that crappy weather we got...10mm hail, woot!