Is such a shot usable. All depends what you use it for and printed at
lower sizes up to A4, I would say yes. I reworked it in ACR, with ACR
noise reduction first and Imagenomic Noiseware 4 after, and I can see that the
result is better than the NEX-7 internal denoise treatment at 3200 ISO. Sony's
internal noise reduction is absolutely too destructive.