Imaging resource has just released the complete review of the Pentax K-3:
Pentax K-3 Review - Overview
The review is full of praises:
"
The Pentax K-3 is a true, no-excuses premium DSLR, that stands toe-to-toe with anything on the market, while besting many on features and capability. And its switchable antialiasing filter technology is absolutely unique."
"
The most exciting new feature, though, is the Pentax K-3's impressively-clever on-demand optical low-pass filtering system. This innovative use of an existing technology, coupled with so many new features and Pentax's famous full weather sealing combine to make this flagship DSLR an enthusiast shooter's dream."
I personally enjoys the section
Shooting with the Pentax K-3 II- Time for some more exciting glass! in which the reviewer made a worthwhile effort to use quality prime lenses (instead of the DA18-135mm).
This adds nicely to the in-depth review at PF:
Pentax K-3 Review - Introduction - Pentax Camera Forums
and the more recent review at DPreview:
Pentax K-3 Review: Digital Photography Review