So here's some low light shots I took, of stuff in my room when I felt it got dark enough.
All of the following, are taken from camera, exported as .jpg and then upload to TPU.
Also, No flash was used.
These were around 8pm
50mm f/5.6 ISO-800 exposure: 1/5 sec.
50mm f/5.6 ISO-1600 exposure: 1/5 sec.
50mm f/5.6 ISO-3200 exposure: 1/5 sec.
These were around midnight, with one less lamp on in the room
18mm f/3.5 ISO-1600 exposure: 1/15 sec.
18mm f/3.5 ISO-3200 exposure: 1/15 sec.
18mm f/3.5 ISO-6400 exposure: 1/15 sec.
18mm f/3.5 ISO-12800 exposure: 1/15 sec.
Then here's the extreme 16000 ISO with, and without Noise Reduction in Lightroom:
45mm f/6.3 ISO-16000 exposure: 1/15 sec. No NR
45mm f/6.3 ISO-16000 exposure: 1/15 sec. With NR
Impressive compared to my old A300 to say the least. I wouldn't have any problem printing something at the 12800 ISO with some editing. The 16000 ISO I would have to be a bit more picky, but it's still very usable with noise reduction.