Hi there all, I currently own a canon 50D with a 28-135mm lens (along with other lens but 28mm is the widest I have now). I do a lot of portraits, street, night and events whether it's for a client or personal. I'm looking into the 5D because of its superb performance in low light, full frame, video etc. At the same time I know I can put money into getting faster glass and ultra wide lenses for my 50D. Just wanted a second opinion on this. What do guys think? Thanks!