Mage/knight is dead. You can't compare with this class since stars light channel is now stupidly long and useless.
I used mage/bard a few times and I can say that is a waste of time aswell. Is a mix between a bad support and a really bad dps in ALL aspects, it isn't good in any kind of dmg. It is a copypaste of mage/rogue but with worse numbers in every skill.
Idk how the rest of mages are performing in terms of dmg. I will have to check soon I guess, once the bards fever is down and people start playing old classes. What I can say is, about playstyle (not dmg), bards are WAY more fun and pleasant to play. Mages have 4-5 min long cds in its buffs, most of its dmg come from spamming static field, 1s cd skill with gcd that do a max of 3 hits when there are 2 mobs. Thats it. Almost no other spell is used in almost any mage combination most of the ini. They became boring and slow to play.
Bards have only a few usable skills but we constantly see fast channels and instant skills that make the classes really fluid and cool to play seeing many little numbers on screen.
I don't think bard/druid can be compared with any other class in game. It is super weird designed. Not being able to use many of the skills since is using staff is a bit sad tho. For me bard/mage is the best desgined one. Spam a 3 seconds cast after every skill is a single dmg sustain boost that normal mages don't have and it feels good.