I've been trying a few different setups over the years. They are all with the K-5 and BlackRapid Metro shoulder strap.
First, it was the DA 18-250 and A 50/2, which would have been good if I could manual focus well. But I can't.
Next, I tried the DA 18-250, DA 35 and DA 50 with the vertical grip. Ended up using the 35 most of the time and the other two weren't necessary.
Recently, I got a D-FA 24-70 and tried that as my only lens with the vertical grip as well. It worked out alright, but my shoulders hurt at the end of the day. Repeat that for several days straight and I don't even want to pick up my camera anymore.
Now, I only bring the DA 35 with me and maybe the DA 50 if I'm going out to shoot close to home.
For vacations, I bring the DA 35, D-FA 24-70, and Tamron 70-200. Even then, I use the DA 35 most of the time.
Maybe I can thin it down to just the DA 35? It's lightweight and the focal length is perfect for me on APS-C. Maybe it's time to upgrade to the Limited

Also, I've tried out the Sigma C 30 1.4 on a friend's Sony A6000 and it was great, so I guess it's between the Sigma Art 30 1.4 and the Pentax 35 2.8 Limited for me right now. Has anyone tried both of those lenses out?