"Studio work" covers a broad range of things.
People, things, or ?
How big is the studio?
Head shots or full body?
Strobes (like at F8 to F11 range) or hot lights or daylight?
Tripod or hand held?
I use the 24-70 in the studio the most, with the 70-200 and 50 1.2 following in that order. I've also used a tamron 24-135 and canon's 28-135.
For low light or hot lights or window light you want a fast lens. It helps for strobe work in that you'll get focus more easily when all you ahve are the modeling lights to work with (for focus). The 24/28-135 lenses ar e nice because you can get a full body, 3/4, head and shoulder and head shot without having to move, repose, relight the subject, and they both do decent close up/macro work, and are pretty cheap to buy and make good walkaroudn lenses.
I shoot a good bit of studio strobe work at F4 when on location (to keep the muslin BG OOF) so the 3.5-5.6 lenses became less used by me.
The only time I use the 50 in the studio is for very shallow DOF, natural light shots (1.2 to 2.0 range), usually with window light or just the modeling lights.
I now have a bigger studio and just got a 5D so the 70-200 will be more useable, but it has a large min focus distance.
BTW, most any lens will be better than your 50 1.8.
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