I've read a million of these "Pentax justification" threads, and mostly just avoid them. There is seldom anything new discussed, and it really boils down to your personal preference or your specific needs. There are cameras for most any need, some are Pentax, some are not.
My own experience has been that my K5 is the best Pentax I have owned, fully capable and a delight to use. Some thoughts after reading this particular thread........
It's not all in the camera, it's often in the skill of the shooter or just plain luck. Here is a shot I got that two Canon and one Nikon shooter missed, and it turned out to be one of the brides most favorites. I attribute it to the K20D, the DA*50-135....and since I am short on skill....a little luck.
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At another wedding, Mrs Rupert was using a little Toy Camera X10 and captured this, which also turned out to be one of the brides favorites........had to be luck, she had never used the X10 before and is in no way a camera person.
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Bottom line for me is to have a camera I like and can use, and use often. The name matters little, but Pentax has been a winner for me, and apparently for a lot of others...we do have a lot of Pentaxians here after all. These debates will never end, but us happy shooters will not be bothered by them, we are busy doing what we love best...taking great shots with our Pentax gear!
My K5 always puts a smile on my face...and sometimes on others too!
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Regards & Happy shooting with whatever you shoot with!