According to PFF, the numbers here are all derived from passing attempts targeted 20 yards or more downfield.
They rank em all: https://www.profootballfocus.com/data/signature.php?tab=signature&season=2014&stype=r&pos=qbd&teamid=-1&filter=25
Davis is 5th in attempts.
He is 2nd in accuracy percentage, which accounts for dropped passes
He’s 3rd (which is bad) in number of dropped long passes.
He’s 9th in TDs off of long passes.
He’s 7th in percentage of total passes thrown long.