Frank B wrote:
"An appeal to authority or argument by authority is a type of argument in logic called a fallacy." (Wikipedia).
Incorrect on two points. One, the fallacy is Argumentum ad Nauseam, where you keep repeating. Two, I'm not an official authority in photography - I simply have the images to prove what I say. My original point was that the LX3 is basically a TZ5 with manual controls and without the zoom. Nobody to my knowledge has posted images that refute that.
This statement by you "Why argue with an LX3 owner like me who has decades of expertise in cameras, computer programming, and logical analysis? " is definitely an argument by authority. I think we are both 'guilty' of making the same arguments "ad Nauseam".
I basically agree with your assessment of the LX3 compared with the TZ5, with the obvious modification that the LX3 has a faster and wider lens. Also, based on your comparisons I think the LX3 has less noise at ISO 400. You give very little weight to the value of the wider lens (24mm vs. 28mm) and to the one f/stop advantage of the LX3. That is fine, but for many others these are important features, as is manual control. Finally, even if you are 100% correct in your conclusions as to the relative picture quality of the LX3 vs. the TZ5, it makes no difference to someone, such as myself, who requires manual control and a wider faster lens to meet his or her needs.
By the way, here is a link to PBase where I have some pictures posted from the LX3, including one full resolution picture.