hard to use the 70-200 on the dance floor, so it pretty much sits in the bag. but other than that its very versatile. nice compressed shots at the dance floor. on the dance floor, I have a WA zoom on one camera, the other with the 28-75, a fisheye in my pouch and once in a while when im hunting, I take the 85 1.8 out for a few shots. but youre going to be smack dab in the middle of the dance floor. you wont have the space to use it. a midrange was what your lineup was missing. look at pics and youll see that pros go for the midrange zoom more so than the 70-200 as it does a good 60% of the bulk work. 70-200 is great for BG portrait session, makeup/hair (if you have the space), family formals, nice for catching candid guest shots, nice to get ceremony shots but for the dance floor, its ok, but you have to be out of the traffic to use it. youre making a huge mistake by not using the 85 1.4 lens. the quality of its bokeh can not be done with any other lens. you have caviar in your hands and are using sardines instead. you will wow them with amazing images using the 85.
you have great lenses but also knowing when to switch or to anticipate is the hardest part. thats why the bulk of amateur or semi advanced photogs will just have the 70-200 on one camera, and the other a midrange 28/24-70 lens. they dont take chances. you are creative so you know specific lenses will give unique images. the 50 1.4 will give images no midrange can touch. the 85 is amazing for unique one of a kind bokeh, no other lens can create. you should really have 4 lenses with you. 16-35 for the wide, the 50 and 85 for midrange and the 70-200. juggling them is the hardest part and most dont want to so like I said, they leave the midrange on one, the tele zoom on the other and on the dance floor whip out the WA for a different "get it all in" dance shots.
when the wedding btw?