TeamSpeed wrote in post #14821325
I actually believe getting the glass that is designed for the format body you buy makes more sense than to buy glass for what you might have body-wise later. Glass retains its value quite nicely, so buy lenses that are known to be great for whatever body you have or plan to buy short-term, then if you change body formats, change out glass accordingly.
Also, there's always the possibility you'll keep the crop camera to act as a backup, etc. In that event, it may make more sense to keep the lenses you got for it, even if they are crop-only.
I started off, back when I got my 30D, thinking that I would eventually go full frame, and my first lens reflects that thinking: a 24-105L. But eventually I found myself wanting an f/2.8 zoom for my camera and something that could go a little wider when the circumstances called for it. So I picked up a Sigma 18-55 f/2.8, and later a Sigma 17-50 f/2.8 OS, and that lens is now my "standard" lens. I haven't used my 24-105L for anything to speak of in at least a couple of years.
I'm keeping my 24-105L because I might still go full frame and I've already put the money into it (plus it works great on my EOS 3, though I haven't shot with film for a couple of years).