I play quite a bit with Woki, a very powerful senior member of the scene. He recently switched over from µ to Jin in CS2, and we duked it out for a long while, talking about the matchup.
This is a very, very hard matchup for µ. Here's a good breakdown of Jin's advantages.
Normals have similar ranges, but Jin's trade high reward for strong reliability Jin has the ability to easily set/reverse the pace of the match, something that is normally in µ's hands.Jin's Air to ground game straight beats µ's Antiair game, his jumpins are deep and fast with good rewardJin's pressure is clean, safe, with lots of options around 5bJin can cross people up in the corner after 5b, so be watching
I've got more to add but something came up, will extrapolate more later.