I just got my K-01 (also a stormtrooper) a couple days ago. For $316, it was a no-brainer. I love the look of it, and the ergonomics took no time at all to get used to. With almost every lens, the focus is more accurate than with my K-5. The exception for me is the Sigma 50 f/1.4. It likes to front focus with this lens, and sometimes won't focus at all. If it's not focusing, I turn off the camera and then turn it back on and it's okay again. But, for example with the Pentax 77, it's much more accurate than my K-5. Noise is similar to the K-5. Focusing on the K-01 is fast after the firmware upgrade. It's still not fast enough to get subjects moving toward me, but that's tough.
Focus peaking is nice, but it isn't quite as useful as I thought it would be. With my K 135 f/2.5, it tends to make it seem like things are in focus when they're pretty far out of focus. With shorter lenses, it's a bit more accurate.
With the K-01, highlights blow out a lot more easily than with the K-5. I can recover a lot more from highlights with the K-5.
Overall, it's a great camera. A friend of mine who shoots a Canon 7D was amazed by the K-01 for $316. He plans to get one for shooting video interviews.
A couple shots from a wedding I attended yesterday:
With the K 135
With the FA 77