50mm 1.4 user here, if you're planning to shoot weddings then get the 85mm, 50mm will be short and you'll need longer range especially if you dont want to disturb the ceremony and still get close up shots, although even an 85mm will still be short on some situations. let me add also that the 50mm 1.4 is not ring usm, its only micro usm, doesnt really focus fast enough while the 85mm focuses much faster because of its usm
btw, setting it at 1.4 isnt impressive though, you'll need practice since it has very shallow DOF and its a bit soft but still faster than at 1.8, the 50mm 1.4 shines at 1.8 and above while the 85mm is already sharp at 1.8
but for everything else the 50mm would do just fine, its up to you.
you can check my
blog, most of it are shot with the 50mm 1.4