Well, I got a Canon EOS-1D in E- minus condition for $300 at Adorama. So far, I've been able to shoot about 50 images. I've been limited because the battery supplied dies after about 25 images (complained to Adorama as well as ordered a new battery for $23).
I contacted Sigma and they said my APS-C lenses would fit on the D1 no problem but there might be vignetting.
My Sigma 17-70 vignettes out to about 20 mm. It's still usable out to 17mm but I have to crop maybe 5 percent of the image.
I tried my Sigma 10-20 which vignettes out to about 12mm. The APS-H sensor seems to really accentuate lens distortion so I'm not sure how overly usable the 10-20 will be.
The canon 70-200 F/4 lens works great with no vignetting (it's an EF lens). However a little too "telephoto" for a walk-around lens so I'm working with the Sigma 17-70 and the 70-200.
Took me a few hours to figure out the menus and buttons as they are a little different from my Canon 20D. However the step up to a "pro" body is quite rewarding. Already taken a couple of really good keepers coming of the APS-H sensor. Still training my wrist to handle the "heft" of the body though. After using this camera, it's difficult to get excited about my EOS-20D.
There is no question in my mind why the Canon EOS-1D became a "classic" as soon as it was delivered. Rock solid cam with great image quality.
I have experienced the dark "banding" associated with high ISO, low light images. I had to turn on the 2nd level of noise surpression which handles most of it.
I find the images don't need much post production. I tend to adjust the white balance by using the eye dropper adjustment and maybe slightly adjust the exposure by a quarter stop. I crop away any vignetting issues.
Love the color matrix settings! So much better than the Canon EOS-20D.
Anyways, so much for the rant. I would definitely recommend purchasing a used EOS-1D at these used prices. I find the photo quality picks up about 20 percent quality (subjective) in comparison to my Canon 20D (APS-C). I'm not convinced that packing more pixels on these APS-C cameras is doing much for quality. The APS-H sensor beats it hands down.
Wish I could afford a full frame, but don't have the budget for both the camera and the number of full frame lenses I would need to purchase (kind of wish I never bought EF-S lenses but stayed with EF but hindsight is 20-20). Will wait until the full frames drop to $300 used (lol). Feel sorry for the suckers that bought these cams at full MSRP!