Slater
Headphoneus Supremus
Though I oddly don't hate my KBear F1. I prefer DD only setups at the lower end of the market but the F1 is very competent.
I didn't tried the Kbear, but a friend of mine did, he said those have way less detail but also less brilliant than ZSN Pro, i don't know if they are worth it against those
It depends on which F1. There’s 4 different ones. I own 3 of the 4, and the Bellsing version is noticeably better than the others. Hopefully I can get my hands on the 4th and final variant someday.