I use 5D Mark III and different kind of lenses. That ain't sport camera because of slow frame rate, but you can compensate it by knowing the game. 70-200/2.8 IS II might be the best lens for indoor volleyball. Only issue is 2.8 aperture - I must use ISO 6400 with that to reach 1/1000 shutter speed. Other lenses I have been using are 135/2L, 85/1.2L and 35/1.4L. It really depends what you want and if you know the game, 85's slow focus isn't big issue. Of course, with 70-200 and 5D III or 1Dx you get instant (and I mean instant) focus which you cannot get with 85/1.2.
Good places to shoot are back corners (from seats or something else up from court) to shoot blocks and attacks, both sides (from court) to get feelings and reception shots and from backside to get blocks/attacks. 5D's focusing system is amazing and it can take a while to find optimal focus methods based from where you shoot, but when you find correct one, even the toughest situations are easy to shoot. It doesn't matter if middle blocker stands in front of place 6 player while hitting pipe, focus keeps rocking