First Greg, from someone who shoots with both the 10D and the 20D, the 20D is a substantial upgrade. While the actual pixel increase (from 6 to 8 MP) is not a big deal, it still gives you a little more room for cropping. However, the camera functions are substantially better. One thing you notice right away is how fast the images are available for viewing (chimping), particularly when you are shooting a burst of 5 or 6 pictures quickly. The autofocus system is better (although in truth I never had much problem with the 10D). The 20D is a great camera, and today with all the discounting and Canon rebates, it's a bargin of the first order.
Okay, the rebates and discounts are available for a reason, it's pretty obvious that Canon is introducing a new camera to replace the 20D (25D, 30D, 40D, whatever), probably in March at PMA. Based on Canon's typical roll out, the camera should be generally available sometime in early April. While I have no inside information it's fair to assume that the autofocus system will be improved (I'm guessing a few "hidden" focus points bunched around the center to improve tracking of moving subjects, like the new 5D). There will be an increase in pixel output, again I'm guessing to slightly over 10 mega pixels. And almost certainly the screen on the back of the camera will be increased in size quite a bit which is welcomed. Will it be a big improvement over the 20D, as much as the jump from the 10 to 20D? It will be better, probably not enough to wait. Look at it this way, for the same money (given the discounts and rebates) would you rather have a 20D AND a 17-40 f4L zoom today, or a 40D by itself sometime in April? Ahhh, for me it would be a no brainer (no shock there, I actually have no brain!).
Now, the 5D. Great camera, the jump to almost 13 Mega Pixels is a big deal (as anyone who saw the original files from Canon's 1Ds several years ago knows) and the camera is full frame. The view finder is huge compared to the 10/20D, and the increased control of depth of field compared to a cropped sensor camera is important to many fashion and glamour photographers. But nothing is free, you could by three (as in 3!) 20D's today for the cost of one 5D. Or two (as in 2!) 20D's, the 17-40 f4L zoom AND the 70-200 f4L zoom for the cost of 1 (as in one) 5D (again given all the rebates and discounts available). OR ...... a 20D, a 24-70 f2.8L zoom, a 70-200 f2.8L zoom, the virtical grip, an extra battery, a one gig CF card and a decent camera bag (whew!) all for the cost of one 5D!!! (All prices based on major online retailers such as KEH in Atlanta and include Canon's triple rebate program.)
Me? I'm caught in a bind. The simple fact of my business is that while the average art director at an ad agency might not be the sharpest blade in the drawer, they can all count. To them 8 is better than 6, 13 is better than 8, and unfortunately (for me) 16 is better than 13. So at a minimum I have to have a 5D. Never mind that most of what that camera will produce (in terms of pixel count) is meaningless when it comes to final print size, they want it and I have to provide it.
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