Welcome to the forums. You will find lots of information about the K-01 in the dedicated Pentax K-01 forum. I have just started to use a K-01. Like you, I also have a K-10D. The K-10D is great but I like the K-01 because it is smaller and a little bit more convenient for my work, most of which is outdoors. The only place where the K-01 loses out to the K-10D is that it is not weather resistant. But that just means taking normal care with it.
If you want a rough idea of what the K-01 does, you can check my albums. In an album called "Comparison" there is a series of images taken with the K-01. Lens details are provided with each image.