is the screen a higher resolution?
I have seen some of the nice nikon cameras and the screens always look very sharp and the colours look great.
I'd like to see some of the straight from camera results the sigma 17-70 gives you if you wouldnt mind.
Better yet if you still have the 400D shoot the same pic with the same settings and show us to compare
for RGREBBY
heres a couple of pics with crops of the eos50d and the sigma 17-70mm
Original picture taken without flash
Crop 100% from the above
exif data:
File Name IMG_0008.JPG
Camera Model Canon EOS 50D
Firmware Firmware Version 1.0.3
Shooting Date/Time 04/02/2009 15:22:01
Owner's Name
Shooting Mode Shutter-Priority AE
Tv( Shutter Speed ) 1/125
Av( Aperture Value ) 4.0
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 1600
Auto ISO Speed OFF
Lens 17-70mm
Focal Length 36.0mm
Image Size 4752x3168
Image Quality Fine
Flash On
Flash Type Built-In Flash
Flash Exposure Compensation 0
Shutter curtain sync 1st-curtain sync
FE lock OFF
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Standard
Sharpness 3
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 0

tandard
Highlight tone priority 0: Disable
Auto Lighting Optimizer 0: Standard
Peripheral illumination correction Disable
File Size 5292KB
Dust Delete Data No
Drive Mode High-speed continuous shooting
Live View Shooting OFF
Date/Time(UTC)
Latitude
Longitude
Altitude
Geographic coordinate system
Camera Body No. 0430334270
Original picture taken with flash
Crop 100% from the above
Exif data:
File Name IMG_0009.JPG
Camera Model Canon EOS 50D
Firmware Firmware Version 1.0.3
Shooting Date/Time 04/02/2009 15:22:51
Owner's Name
Shooting Mode Shutter-Priority AE
Tv( Shutter Speed ) 1/125
Av( Aperture Value ) 4.0
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 400
Auto ISO Speed OFF
Lens 17-70mm
Focal Length 36.0mm
Image Size 4752x3168
Image Quality Fine
Flash On
Flash Type Built-In Flash
Flash Exposure Compensation 0
Shutter curtain sync 1st-curtain sync
FE lock OFF
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Standard
Sharpness 3
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 0

tandard
Highlight tone priority 0: Disable
Auto Lighting Optimizer 0: Standard
Peripheral illumination correction Disable
File Size 5671KB
Dust Delete Data No
Drive Mode High-speed continuous shooting
Live View Shooting OFF
Date/Time(UTC)
Latitude
Longitude
Altitude
Geographic coordinate system
Camera Body No. 0430334270