Bigger quality drop than expected using portrait format photos?

I was compiling a slideshow of pictures from jpegs. There is a mixture of pictures in landscape and portrait formats. My camera has an image size of 5616 x 3744. This means that iMovie has to scale the image down to my 1980x1080 regardless of the source format. Even for portrait images it is scaling by 50% for a full width section.
Portrait images they are always dictinctly softer than landscape images. If I do a 2x zoom in a Ken Burns on a landscape image it loses very little sharpness despite using a lower scaling factor than a full width portrait image.

Findings:
Aperture:
Export at Quality =5, 1280x1280 max. (the same settings as my Previews) gives me an export JPG that is 176k. The actual Preview within the Aperture Library structure is 76k. I rechecked and recreated ... still 76k.
I looked at both in CS2, and the export is very much better quality than the Preview. resolution is correct, so, Previews are not adhering to the Quality setting. So, I believe there is a bug in Aperture!!!
I then did a test on iPhoto. Export jpg from iPhoto was 272k at 1280 x 1280 max. BUT .... iPhoto does not allow a Quality setting, so I cannot compare apples with apples. Here's the comparison:
iPhoto=272k
Aperture Q=5 = 176k
Aperture Q=7 = 240k
Aperture Q=8 = 284k
So, it looks like iPhoto exports at around a Quality of 7-8.
In terms of image quality in CS2, I would say they look identical for resolution, but iPhoto has significant color casts and much harsher sharpening from its RAW conversion. Overall, the Aperture jpg (no adjustments to the master RAW) is superior to iPhoto assuming that iPhoto does export at around Q=8.
G.

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