http://www.olympus.co.jp/en/support/imsg/digicamera/download/software/#firmware
The Stylus 800 is the fifth last in the firmware list.
Please note:
1) You need to install Olympus Master, which gives you the link for the upgrade. The upgrade is done from the server, no executable is downloaded to your computer. This is different from some earlier models.
2) They DON'T promise to reduce the excessive processing. It is just my opinion that this is what they have done. Nobody here has yet seconded my opinion.
I have just done some 100% crops from my recent Stylus 800 pictures, which were taken at SHQ. Looking at them at screen size, I can't see the fuzzy edges that my Stylus 800 produced straight out of the box. But they still have a little more sharpening when compared against the 810 samples posted here.
3) I have upgraded to firmware V1.1, then to V1.2, both of which worked. But Olympus tells you, you can't go back if you are not happy, at least not without a service.
Keep in mind, according to this thread the 810 gives you 8 Mp resolution at 1600 ISO, but has no shutter priority. It comes down to the frequency at which you are prepared to upgrade.
To post my new samples I need more time. I will do that if you ask me to do so. In the mean time, my Stylus galleries start in July 2005 at the link in the footer. They are interspersed with C-750 galleries.
Henry
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Henry Falkner - C-40, C-750UZ, Stylus 800
http://www.pbase.com/hfalkner