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Christopher,
Regarding aliasing, you can't always get rid of it in post. By definition aliasing means misinterpreting high frequencies as lower frequencies. For instance, when a patterned shirt aliases into large patterns of dark and light areas, you can't filter that out in post.
Fortunately, large aperture shots put the background out of focus, and that helps us avoid aliasing in large areas of the image. This won't help though, if your subject is wearing fine plaid.
The best solution would be a great lens with an ideal blur filter. The perfect filter would have a sharp falloff - removing aliasing frequencies, but keeping 1080p level detail. In practice, the best we will be able to do with a good blur filter is 720 lines of resolution or so.
BTW, I spoke with Tiffen at CES and let them know about the business opportunity of selling OLP filters for the 5D, D90 and other DVSLRs. I need to follow up by showing this thread and others.
Personally, I think the biggest benefit of good lenses on the 5D is low light falloff at wide apertures. Sure, you can correct for the light falloff in post, but the dynamic range of the picture ends up being non-uniform - the corners will have crushed blacks compared to the center of the image.
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