Did it on three characters (and with two other people on one of those times). Of the five possible drops between us only one was a legendary engram (special weapon engram, turned into shards).
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1/5 was a legendary? That seems to be consistent with the drop rates I've been seeing in my data as well. Still a small dataset, but I can say with 99.9% confidence that the legendary drop rate is between 7.9% - 23.8%