Ok, so I need everyone's help. As of now, I have a Digital Rebel XT and I am about to upgrade to the 5D. I already have a 17-40 L lens. My question is, do you guys think a 17-40 mounted on a 5D would be decent for portraits? My girlfriend needs me to do her senior portraits and I told her I would once I get the 5D. But, I thought about getting the 5D and 24-105 kit. However, I can barely afford the 5D body alone. I COULD get the kit with the 24-105, but I'd be stretching it. Do you guys think that a 17-40 on a 5D would be good for senior portraits? I know that I can simply crop any photo I want to because of the 5D's resolution, but I still don't know what to do. HELP ME!!! Thanks a lot!
P.S. I'm going to include a photo I took of her with my rebel and 17-40... just for kicks. Comment and critique if you want. It's a good photo, but I'm STILL upgrading to the 5D. Thanks.