I use a 16-35, I don't stick to the extremes but zoom freely for framing accuracy. I also use a 17mm f4 on a T90, as well as a Zeiss C/Y 25mm on an EOS body with an adapter. I can't say I have a preference, and I rarely bring more than one lens per body anymore. I'm learning to make use of whatever I have on hand, and to enjoy it.