IMO recording the DX portion of the image is the same as not working. Why would I want to do that after buying a FX camera? And like I said, I do portraits but I also want to be able to take it out of the house and shoot other things like when I go on trips or walks. I've heard pretty good things about the sigma 135? I'm almost thinking getting a decent wide/standard zoom for the all-around stuff and then the 85 for portrait work.