I have the silver model, like in the test and I have the 55-300PLM. I agree with Chris in these things:
-The grip isn't as comfortable as other Pentax DSLRs. Only the large one is usabel.
-The line at the prism looks and feels cheap.
-The camera is overpriced, but I think it not marginaly better then K-70 and not that overpriced as Chris concludes.
-It would be nice to be able to set up the third dial as a main dial, but I didn't realy missed it. I missed the ability to set up it for changing the minimum shutter speed lmit at auto ISO.
-The live view switch could be more comfortable.
I don't agree with Chris (after taking approx 1300 images with it):
-The third dial. I turned it on the first day some times accidentally, but after the third day it was perfect. (I had similar initial problem with the AF button and the green button.)
-The "marginal high iso performance gain" is not marginal. It's similar to the K-3 to K-70 step I think. (I don't have the K-70, I only pixelpeeped images in reviews)
-The new SR mechanism is amazing
The AF is improved by much, see my post here:
Pentax KP Continous focus test - PentaxForums.com
The new SR is realy amazing I can hand hold
easily the 55-300PLM@300mm with 1/30s or the DA* 50-135 with 1/10s! This is really 5 stops from the 1/(2*focal length) rule.
The things you get over the K-70 is:
-Silent shutter
-Shutter speed limiter
-Better shake reduction
-Better high ISO performance
-Working 3D tracking AF
-Program lines
-Configurable buttons and function dial
-Option for a grip
-Wireless flash controller mode on board
-A lighter wallet to compensate the magnesium alloy body
And the things missing from a high-end body:
-Top lcd
-AE lock button next to the AF button
-AF area selector button
-200'000-300'000 cycle rated shutter
-IR control (and Image sync app is realy bad.)
-More lighter wallet...