Actually the shooter is more important than the lens. Are you good enough to shoot a once-in-a-lifetime event? 600+ shots sounds like you can't make up your mind. In the film days that's almost 20 rolls, nobody would have done that.
Your gears are fine but westwest is absolutely correct.
If it's a friend, and you are shooting their wedding, you will be WORKING while everyone is having a good time. Have you thought about that? Have your friend thought about that? Does he/she wants you to celebrate his/hers wedding with him/her and merely to provide free photography services?
I have jsut last week, attended a wedding. The groom is one of my best friend in Singapore. And I decline to shoot for him at any capacity. I told him I rather celebrate the big day with him. All's well. I managed to get the door openned for arguably the smallest angbao in recorded history.
Long story short, unless you really want to shoot, and you are confident in delivering the pictures, don't.
Equipment can only deliver so much in terms of photo quality.
It's the person knowing when (at the precise moment) and at what settings to use before pressing the button to take the picture that counts more IMHO.