At what ISO did you start to notice noise?
At ISO 400 But I was shooting with DRO enabled, it probably lifted shadows and increased noise somewhat.
BTW, have you seen this NEX-7 ISO 6400 sample? I think it's excellent. It will make a beautiful 20"x30" print.
Hmmm ... that 6400 file didn't look that impressive to me. Am I missing something? Nice DR and colors for sure. But looks quite soft and somewhat smeary. Sorry ... must be the pixel peeper in me. Wondering if the NEX5N might be the way to go ...