The Battery life on the K3 was the deal breaker for me. I can get 200 extra shots with the K5. Another reason why I chose the k-5IIs was the higher dynamic range and slightly better picture quality.
No pun intended, I will probably purchase a K3 sometime in the future, but right I don't see any reason to upgrade. More focusing points ? I usually only use the center focusing point. Extra card slot. I can store plenty of pictures on my 16MG card with room to spare. If I was shooting weddings that would be a different story. Higher resolution ? Might come in handy if I needed to print 30x40 prints often, or I needed to crop a lot such as in birding which I don't do a lot. Just means less pictures on my card and more problems for my computer.
Tell you the truth the pictures on my K-5 IIs are so sharp I really don't see ho they can be improved any further. Bigger back LCD, who cares I can see y LCD plenty with no problems. Movies/Video, I have a Sony Cam that will put both cameras to shame. Let's see now
smaller, lighter, cheaper and ISO 80.
GO K-5IIs ! One feature I would like to have is the AA simulation but you can't have everything...