I have only taken about 300 shots with my K-01, as I just got it a few weeks ago. I like my K-01. I'd give the K-01 about a 92% grade. And I'd rebuy the K-01. The kit pancake lens is also better than I thought. Nice little gem Pentax designed.
Here are a few taken with the K-01.
The only things I don't like with the K-01 are the flimsy rubber side cover for the mem card. And the shutter release is kinda hard to actuate sometimes due to it is pretty flush with the body. The $10 lens cap is easy to lose. (I lost mine on the first shoot.)
Oh...wish it took 4 AA batts. But since it runs on the same batt as my 645D I sprung for K-01 to see what the deal was with mirrorless design.
All in all, I prefer the DSLR. But the K-01 is much better for low light cave shooting than the DSLR. And some other types of shots lend themselves to the K-01 over the DLSR. K-01 is much better at shooting on the fly stuff like zip lining than a DSLR. Sure, you can use LV with your DSLR. But if your busy hanging onto something you don't want to be pushing more buttons and screw around. The 'easy on' lever of the K-01 is fantastic! Switch on, live view, frame and shoot! Will work good with gloves in winter I suspect.
Also found a use for the K-01 when using a dual flash bracket. When shooting with a fisheye or super wide I use 2 flashes pointed at different angels to cover the scene. (High and low flash) The DSLR raises the 'on cam' flash too high to adjust in the postion I liked. The flash on the bottom would hit the top bar of the flash bracket. The K-01 left enuf room for adjusting the flash cause it had no prism and hotshoe was lower.
So DSLR and K-01 both have their uses.
Have both cams in your kit!