Saw it theatrically, and found it a vast improvement over #3, which spent far too much time on his wife's illness, not to mention the laughable inclusion of Mike Tyson, whose line readings are even more wooden than the Chinese actors'. I did find it interesting that Bruce Lee is presented as a real jerk, which would seem to validate Tarantino's depiction of him in OUATIH. Still, the series' apex remains #2, thanks to the inimitable Sammo Hung--both on and off-screen.
I thought the depiction of Bruce Lee was better than in Tarantino's film. The actor who played Lee in Ip Man 4 also plays Lee in The Legend of Bruce Lee series that's on Netflix, and that series has the blessing (and production efforts) of the Bruce Lee family (namely daughter Shannon).