Well, mine was built in June 2011 and lost it's 1st bar in May 2013 at 33,000 miles. I didn't have LeafSpy or equivalent at the time so let's assume it happened at 85% remaining. By that time it has seen many QC sessions, 2-3 per day on several occasions, and 100 degree ambient temps. I did charge to 80% on the end of charge timer daily. As far as I can tell your 2nd Leaf's battery isn't showing any dramatic improvements compared to mine.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
51.1AHr, SOH 80%, 150k miles