I just tried it with my 50D RAW files and the results are way better than the pre-release 4.6. Finally I'm happy with my new camera. The colors feel more natural and the sharpness is way better than Canon's in camera JPEG file. I've never been a fan of using JPEG in camera since I switched to RAW so I confess to being a little biast :)
Anyways I did a quick load it and save it RAW test,
find it on my blog here. Images are some what large due to screen capture from my desktop.
Regards,
Peter Witham