I'm hoping to get a quick response. My sister just informed me last night that they wanted me to take some family portraits today.. There will be about 15 bodies there. All I have is the kit lens with my xt and 430ex flash... I'm thinking of renting the canon 16-35mm f2.8 from a local shop. I will be taking pictures outside and inside. It's pretty sunny outside. Question is, will that be a good portrait lens? How well will my xt handle the lens? Here is a list of lens that they have for rental. Any other suggestions for lens? Thank you all in advance.. 
24mm f3.5L TS-E
50mm f1.2L USM
50mm 3.5 Macro
10-22mm 3.5-4.5
16-35 f2.8 L
24-70 f2.8 L
24-105 f4.0 L IS
70-200 2.8 L IS
28-135 3.5-5.6 IS
70-300 4.0-5.6 IS
300mm f2.8 L IS
100-400mm 4.5-5.6 L IS

