If it's any (basic) help, or at least empathy, I have a G9 and a 5DMKII. RAW images from both of them end up looking quite different once loaded into Aperture. Once I upgraded, I realized the RAW images did look a little muddy and just gross SOOC of the 5D. I have everything set to neutral. The first image doesn't look that surprising to me, actually. And, with the new Aperture release, I think did they remove some of the in-camera adjustments, or the option to do so? We can see the nicer-looking adjustments "go away" as they are loading for the first time. I'm not sure that was much help.
I hear what your saying.
My understanding is that Aperture loads the embedded jpg first so as to have something to look at while it is processing the remainder of the RAW file. Then the entire RAW file pops into view once its finished processing. Unfortunately I can't comment on the difference between my T4i before and after the upgrade to Aperture 3.3x since I didn't have the new camera until last week. I am still of the opinion that while Apple made some changes they need to revisit I need to do better with my exposures too!

