Originally posted by ChatMechant I planned on keeping my k3 for telephoto use when I got the k1. didnt take long before i sold the k3.
Same, except I haven't sold my K-3ii yet. Not because I use it or anything, it's because I'm lazy. The 150-450 + K-1 is so much better when you don't need to crop; when you do need to crop, well, yes it's a little worse but the K-1 uncropped is so much better I just gave up on having long crop shots for print. I may take fewer bad photos, but I also take more good ones... That said, I think there are some amazing options out there for sports/action photography where higher frame rates may be the difference in capturing the critical moment and not. I do OK with birds and action, but it's probably more work and fewer total keepers. I haven't personally used any of the new high frame rate competitors though so I am no use in helping provide a recco.
I've heard feedback from my friend with a Nikon that if he wasn't invested in the lenses and totally knowing all the menus etc, he'd consider Pentax after seeing my K-1.
If you're going pro, you'd likely end up with multiple bodies -- If I were you, I'd get the K-1 because it will be familiar and easy to get going with. If you find there are specific things that you can't get done with the K-1, then consider what body/lens combo might change that!