My first night out with the 40D was this past Saturday. Here are a sampling of shots.
Focus - TONS better than the 30D -nearly as good / fast as a 1D.
Tonal quality/ IQ - big step up. Not sure I'd say it's as good as a Mk3 or 5D, but it's damn close.
Highlight priority is awesome!
RAW, converted in DPP - faithful pic style, +1 contrast, +1 saturation, +1 color tone, 3 sharpness.
Opened in CS3 - USM 200%, .3, 3.
Resized as you see here.
USM 30, .7, 3
Save for web.
NO curves, no other adjustments at all - nothing.
Info per pic added as needed:
70-200 2.8 IS ISO 100 F2.8@ 70mm, Av mode
http://i.pbase.com/o6/77/624677/1/85...tJohnston_.jpg
85 1.8 at F2, ISO 800 1/1000, Av mode
I did a bit of blur on her cheek/chin/forehead.
http://i.pbase.com/o6/77/624677/1/85...tJohnston_.jpg
17-55 2.8 IS lens @ 55mm, F4.5 1/60 at ISO 800
http://i.pbase.com/o6/77/624677/1/85...tJohnston_.jpg
Same people, same pose, outside now
70-200 2.8 IS @ 160mm, F4 1/800 at ISO 100
http://i.pbase.com/o6/77/624677/1/85...tJohnston_.jpg
And lastly a high-ISO to show the worst of the worst this machine can do.
I didn't do the initial USM on this, and there is NO noise reduction, not even in DPP. There was NO flash for this image.
17-55 2.8 IS @ 17mm, F 2.8 1/40 at ISO 3200 Tv mode
(Yes I work in DARK places

)
http://i.pbase.com/o6/77/624677/1/85...tJohnston_.jpg