Great phone. And even better for a 24/7 photographer.
Been using this since six months now, and as long as you know its limitations, it'll serve you well.
Here's a copy-paste of what I pm'ed Keane16 a while ago about taking shots with the K790i.
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Here's what the K790/K800 is good at:
1. Macros
2. Daylight photography
That's IT. Any night shots from this camera are only just "snap" but not "photos' since they are sooo noisy..
Lastly, ALL snaps which come out of the K790i are dull and very very neutral. So a quick fix is required for all the snaps. I use Adobe Photoshop and what I do is:
1. Adjust levels - darken the shadows by a significant amount and slightly overexpose the highlights.
OR
2. Adjust curves - to a more 'S' shaped curve in Photoshop.
3. Sharpen
4. Remove Noise using NeatImage (sometimes)
You can achieve most of this in the phone itself by using the PhotoDJ application by simply using the "Auto Level" function, though its a very very basic function.
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Read it. Go through my shots in my flickr page linked below. And see what this phone is
really capable of.
Congrats again!
Payne
PS: No firmware trick will get you close to what you can do with post-processing.
PPS: Do NOT try night photography with this phone, the noise kills everything.

Evening, twilight is fine...but not night shots. Flash is also ok for general purpose shots.