Some sample shots from Mr Beef 2014, using the Tamron 17-50 f2.8, X mode, AF.C, Sigma DG 530 ST.
I've shot this charity event for four consecutive years now. The K-3 did very well. Of about 600 shots, only about 2 were throwaways due to missed focus, which is better than the K-5 or K-x, which I have previously used for this event. It's the only event where I ever shoot flash, but next year I think I will skip flash entirely. The K-3 can cope with low-light focus and high-ISO (if need be) without any problem. The biggest issue was colour temperature variation under mixed lighting (flash and stage), which you can see at work in shot #1. I may re-tune the AWB of some shots later.