Originally posted by Primes4ever The K-01 strength is using smaller lenses and is a challenge with longer, slower lenses. I had some success when I tried it with my 100 macro at a basketball game but find longer lenses awkward. The K5 is much better as would any DSLR due to the optical viewfinder and focus method.
I like my K-01, just not with bulkier lenses. I find that it is like holding binoculars a foot away from your eyes which makes framing a challenge at long focal lengths. You can use a tripod but that defeats the light and portable advantages.
dSLRs with phase detect autofocus are the best cameras for action photography. (This includes Sony SLT cameras with the EVF and the fixed mirror for phase detect autofocus.
There are two additional camera systems that are also good for action/sports photography:
1) The Nikon 1 series has superb accurate phase detect autofocus in good light. It will follow focus very well. It is the strength of the Nikon 1 system and the reason to use a Nikon V1 or V2. This is only true with Nikon 1 lenses, not with AFS Nikkors mounted with the FT1 adapter.
2) The Sony NEX series with the Alpha adapter with the fixed SLT mirror. Very fast and accurate autofocus including follow focus. This only works with Alpha lenses designed for Sony autofocus lenses for their SLTs and dSLRs. Even though the NEX 6 and NEX 5R (and probably the soon to be released NEX 7 update) have phase detect sensors in the image sensor and an increasing number of lenses that are compatible (or up-dateable to compatibility) with the phase detect sensors, there are no reports of fast AF with E mount lenses especially compared to Alpha mount lenses.
Different cameras have different strengths. The Nikon 1 and dSLRs (including the Pentax K5 and K30) are better tools for Sports/Action photography than the K-01.
For other types of photography, the K-01 is a superb camera.