I cannot say I am a pro, but I have been assisting a photographer (although she doesn't do weddings) for some time now and she always uses her RZ 67 pro. I'm not too sure about her choice of lens, but I have seen her shoot with 110mm and 180. The picture quality is perfect, but I'm not too sure how you work a digital back or even a Polaroid back with this camera.
I guess my input to your thread would be that I personally like the quality of this camera a lot.
You can see some of her photographs in the following link and judge for yourself: