Here are a few photos from my side, I picked up the K-1 last friday in the morning, and in the evening, I was attending an international meeting of young circus artists... in really low light...
(all photos K-1 with DFA*70-200/2.8)
1
200mm, f/2.8, 1/160s, 3200iso
2
200mm, f/2.8, 1/200s, 6400iso
3
200mm, f/3.2, 1/250s, 12800iso
4
170mm, f/3.2, 1/200s, 2500iso
5
200mm, f/3.2, 1/200s, 10000iso
6
115mm, f/3.2, 1/125s, 8000iso
7
78mm, f/3.2, 1/125s, 32'000iso
8
140mm, f/3.2, 1/200s, 5000iso
9
88mm, f/2.8, 1/160s, 1250iso
10
200mm, f/2.8, 1/160s, 12800iso
The conditions were not really ideal for photography, but the K-1 did really well regarding AF, high iso capabilities and metering accuracy.