Question about Brother MFC-L8390CDW

Yes, I only have Macs and it works perfectly.

Yes, especially with mac

Yes, of course! These days, almost all printers are compatible with OSX.

according to description = YES

PS: it's an excellent device, I'm very happy with it.
it is currently available from Fust incl. cashback for around CHF 300 ;-)

mac is not included in the system requirements.