I currently own a 40D and a reasonably good selection of lenses. I was eagerly awaiting the 5D replacement at PMA, but now it seems likely it won't be available until the Fall. So, is it worth buying a 5D if I already own a 40D?
The only reason I would even consider it at this point is the Canon Canada double rebates. I can get a 5D for just over C$1750 with tax after rebates. It would cost about $2450 with tax from B&H, so there is quite a big difference. The added benefit of this is that I could sell it at the end of the year if I decide I desperately need whatever Canon releases then, and I probably wouldn't lose too much. Plus, I would have a 5D to use for nine months, of course. That's assuming I even want to sell it later...
I have thought about it for a while, and I know whatever camera I buy next will be full frame. Many of my favourite lenses just work better at their proper focal lengths, rather than at a 1.6x crop. I'm now at the point where I no longer want to be buying lenses for their focal length equivalent (35/1.4 as a 50mm equiv. for instance). I'd also like the improved DOF control and larger viewfinder. I'm hoping ISO 3200 might be somewhat more useable, but that isn't a deal killer.
I would likely end up using the 40D for the tele end of things (especially with my 100-400), and the 5D for wide and portrait work. I'd probably end up selling my Tokina 12-24, or trading with someone for a 17-40/4.
Some points:
1) I don't DESPERATELY need a full frame camera right now. I COULD wait until the end of the year. However, I'll be taking a couple of months off work in the Summer and then starting a five year program at university in September, so this will be my last free Summer until 2013! 
2) I'm not sure the 5D will get me much more than the 40D in terms of image quality other than absolute resolution. In many ways, the 40D is the better camera. It isn't full frame, though...
Any thoughts?

