Happens I took some pictures at a multiple dance disciplines event at the Hallen in Amsterdam,
where one of the performers was a local tango school Tangotalks
Have shot dance way back in the early 80's
http://www.pbase.com/paul_k/jazz_1982Apart from the fact it was on film, I, since there were no AF camera's around yet at that time,
basically used completely different gear then you did
(F2AS, FE, manual focus 2/28mm AI, 1.4/50mm AI, 2/85mm Ai, Tri-X pushed ISO 800+)
As you can see from those images. lighting was pretty awful ( fluorescent tubes on the ceiling)
so I have to perform all kinds of developing and printing tricks to get usable negatives and
somewhat presentable prints
Since the lighting at the Sunday event was equally atrocious (daylight top lighting from ceiling windows,
any black possible bottom reflection light absorbing floor, mixed daylight - from what ever came from above -
and tungsten fill) as well I decided to go 'creative' and make something out of a potential disaster
As I still love the contrasty b/w Tri-X look from those 80's pictures mentioned above, I threw all 'rules' out of the windows
and tried to emulate that look with my D800, using good old Nikon Capture NX2, with a lot of shadow recovery, added contrast,
and pre 'B/W filter' conversion color manipulation (and creating an excuse for the 'bad' post processing along the way

)
Anyway, as I used a few lenses similar to the ones you consider, here are some of my results
a nearly full frame shot with a 1.4/58mm AFS, a heavily cropped (about 20% of a shot taken in the same wide, horizontal mode as the other 58 mm shot, and for comparison a 1.4/85mm AFD full frame shot
Please be gentle with me for the way I badly processed them, it's just to illustrate the sharpness/back
ground separation I got using a 1.4/58mm AFS (a bit similar to that of a 1.4/50mm AFD nearly wide open, have
one as well so know the 'look' of that lens)