K3 isn't really very bulky. Even compared to my X-E1 the dimensions aren't that far off actually. You can see a size comparison to your K-01 here: http://camerasize.com/compare/#485,285
But it is heavy.
The trouble is that Pentax only puts 14-bit RAW in its flagships I think. For a landscape photographer, that 2 bits can get very useful especially during clear sky sunsets/sunrises, where the color gradation will start to band under 12-bit RAW.
Also another reason why I'm waiting for secondhand XE-2 prices to drop.
True true i agree bro and 14 bit is really important for landscaper. Anw we still dont know whether k-s1 is 12 or 14 bit raw but most probably is 12 bit. I getting it more for light weight travel...anw just wait for it performance report b4 deciding l....