I've done some more testing outdoors with my 645D vs Nikon D3x
Daylight landscape, ISO 100 RAW
D3x, 24-70 zoom lens @ f8 live view manual focus
645D, 45-85mm zoom lens @ f11 autofocus
The focus point was the tree on the center of the image.
After capture daylight color balance in LR, no sharpening.
Sharpening in CS5 D3x shot USM 300,0.4,1 645D USM 300,0.4,1
Some adjustment in CS5 to match the color.
ACR does a poor job with D3x color as rumored.
This was shot near Angels Camp, CA in the Sierra foothills and it really was very, very green.
Warning big files D3x is 44MB, 645D file is 77MB
Comments of course are welcome.