RAW Highlights Problem with conversion from Canon 5D

Hello All,
I recently upgraded my camera from a Canon 20D to a Canon 5D. I shoot only RAW and I recently shot a couple of images of a beautiful sunset out West. I was bracketing the exposures all over the place since the light-drk contrasts were really large and the light was changing so fast. The images looked great on the Camera's LCD but, when I ran them through Aperture I got some really nasty artifacts on the conversions around the highlights. Here are examples:
Full scene
http://www.flickr.com/photo_zoom.gne?id=307781903&size=l
Full scene detail:
http://www.flickr.com/photo_zoom.gne?id=307781906&size=o
Another example:
http://www.flickr.com/photo_zoom.gne?id=307781905&size=l
the problem I see is with the nasty transition from yellow to white in the blown highlight. I also don't like the broad areas of flat yellow - the tonality is completely missing. These are the default RAW settings exported to JPGs and the poor image quality of the highlights looks identical on screen between the RAW images in Aperture and these JPGs, so it's not a JPG artifact.
I don't recall having this problem with the 20D - is the 5D conversion more difficult for Aperture? Might I be doing something wrong? Is there a way to fix this? I ran the RAW file through lightroom and it didn't have the same problem. Please help!
-Steve G

I have the same problems when I shot the sun rise and sun set.. It is very nasty transition from yellow to white or white to yellow from the sun. I don't think Aperture can fix that. It was over the exposure with the sun. And yes, it looks great on 2 inches LCD. I think you need to use filter when you shoot the sunset or sunrise to get the perfect lighting. Let me know, if you know the tweak with Aperture.. I will check out lightroom... I have alot of sunet and sunrise photos to correct.. and i checked out this place http://www.all-creatures.org/pics/sunset.html they have the same problems with yellow to white...

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