I have a question for all the classes out there, I am a crusader and I have never seen a thunderfury drop, just woundering like for Monks/Barbs/Wizard have better drop chance than Crusader/Witch Doctor or?
Almost the same drop chance for all classes, indeed. Although demon hunters are less likely to find one (they mostly get bows and stuff), not impossible but just less likely. For crusaders it's just as common as for any other class; you have class-specific weapons with flails, but every class has those (bows, wands, ceremonial knives, mighty weapons, fist weapons).
I haven't found one of these, a SOH, or a Odyn's Son yet...I have found about 10 horrible eternal union rings though if anyone wants to be jealous! Every legendary I get that is a weapon is a crappy 2her and every piece of armor seems like a horrid ring...I know I know RNG blah blah blah...still doesn't make people like Burzurk getting 3 any less painful!
I don't know the chance, but that's been answered apparently. What I can tell you is that I've never had one drop in ~55 - 60 hours post 70. Never had one drop pre RoS, post patch 2.x either. I've only had the belt drop, for my WD, with a WD affix and 10% lightning skill dmg. Unfortunate because I want that item for my monk and my wiz but not my wd. Owell.