Thank you Stan for an informative response, as always
So far it seams the best use for D700 (having D7100) would be - for low light - "casual" walk around use (with small imprint on a harddrive) and - long bursts in RAW. For me low light is the most important aspect. The other two do not justify having D700 vs say another D7100. I think I will hold on to it until my cousin's wedding and decide based on its performance then.