The actual performance of these lens has been discussed at length - as regards choice of lens for weddings, this varies from person to person. At the 3 weddings (all of friends) I have covered within living memory, I used 2 35 mm bodies, one with a 24 mm and a flash, the other with an 85 mm f2 without a flash for candids (and with a 70 to 210 zoom in my bag, which I did not use). In your case, I think I would be careful not to weigh myself down with too much gear (why 2 MF cameras, for example?). If you do use the 2 cameras, 1 35 mm extra will be as much as you can handle, and the 40 mm Nkoton you already have would be a good lens for candids. Remember, in high-pressure situations, the more cameras and lenses you take with you, the greater the chance of having the wrong camera/lens in your hand at any given time!
Regards,
David