Originally posted by realitarian 
That makes sense, I'll try the longer focal lengths and faster shutter speeds. The clicking itself seems smooth as butter though, probably because the mechanism inside is all new.
In your first point, I assume you meant they fixed stuff that wasn't necessarily broken, just so they could get it to current specs? I thought it was because something might have broke either in their hands or during shipping, they found out the second time and fixed that as well. Unless you have known this happen to others?
What did you mean by "As suspected, some aspects of the K-3 have been improved compared to initial release" in your second point?
Also, when warranty repairs are done, do they replace parts with brand new ones, or reclaimed ones that are in working order?
At a minimum, a change was made in hardware that limits and/or prevents the mirror flapping problem. There are some who have found that the delay in pTTL has been reduced greatly, while others insist nothing has improved. It does appear that the newer units might have considerably less latency, but that's very much speculative.
It would be surprising if there is anything other than new parts going into the warranty repairs. The cost of parts salvaging is generally higher than new parts production. That's even true with refurbished units - most of which are some form of demo unit that is cleaned up, tested (to a greater extent than production units), and packaged up like new.
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