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Originally Posted by st_albert
For what it's worth, I just ran the following experiment.
I took a dual-format mobi file (from kindlegen) just as we would submit to KDP. I split it using kindleunpack (stand-alone version, not the Calibre plugin) into a mobi7 .mobi file and a mobi8 .azw3 file, and tried each of them separately in the kindle previewer, version 2.8.
the "mobi7" file looked reasonable in DX, Kindle3, and paperwhite, with roughly the same look and feel. the "mobi8" file looked good in Pw and K3 but the DX emulation had lots of problems in formatting paragraphs, page breaks, and so on. The images were displayed, but not the way we intended.
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Albert: presumably, this was a "dual" mobi that had images, that had been formatted for KF8, using %, yes? (nm: I just saw below that that's right.)
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So I conclude that the DX emulator cannot "cheat" and read the mobi8 file from a dual-format mobi in order to look good. Unfortunately I can't say whether the DX emulation, when reading the azw3 file, messed up in the same way as a real-workd DX would.
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OK. That's good to know; that's been our comprehension, here. The alternative, honestly, was sort of freaking me out, as the KF7 devices we have here say that they are still KF7, through and through.
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BTW, the book in question was published in 2011, when IIRC there was no kf8 format in production yet. In the epub, the images were coded like so:
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<p class="center"><img alt="images/image002.jpg" src="../Images/image002.jpg" style="width:77%"/></p>
and were tweaked in the epub, then converted with kindlegen (cmd line version, not the previewer), and tested on a real-world K3 (which hadn't been upgraded for kf8).
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Hmmm....so, coded wrong, back then? As KF7 never could display %? Meh, Albert, I'd hate to have our 2011 books come back and haunt us (although they do!).
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All of which makes me very grateful that of the couple of hundred ebooks I've formatted since then, only 2 or 3 have had images other than the cover 
Albert
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I feel ya. We have thousands--hell, tens of thousands of images, formatted, out there. I spend a lot of time thinking about what we'd do, if something happened and all our clients demanded that the images be REformatted....
Hitch