jounetsu wrote in post #3962062
I'm just thinking that the IQ of 5D is better, as is the depth of field control, and I like 24-105mm on FF. But it is pretty expensive...
Have you thought about reversing the question and asking what the 40D isn't doing that you really want it to? Are you missing certain shots because of a limitation on the 40D that the 5D will address?
I'm pointing this out because, from what I've seen, the 40D's IQ is superb, and the early indicators are that it's an otherwise excellent camera. I'm also huge supporter of the 5D and I think it's the best camera that Canon makes on a dollar for dollar basis. However, because the difference in price is roughly 300% for the total package, I don't see a whole lot of cost-benefit. 90% of pictures that can be taken with a 5D can also be taken with a 40D at similar quality.
So...were I in your position and willing to pay the difference in price to upgrade kits, use that money to first get the 24-105 4L IS or the 24-70 2.8L and shoot with that on your 40D. If that reveals a real failing of the 40D body, then get a 5D. Generally, the wisdom on POTN goes like this: unless you really need godzilla sized prints, get glass first, then get a body.