Few ISO 1600 shots with Nikon 1 V1 and 18.5mm/1.8 lens

Here are three shots taken with V1 plus 18.5/1.8 combo. All are ISO 1600 and I have done only very mild noise reduction in Lightroom 5. I found all these quite acceptable. What do you think about the amount and nature of the noise? Please, click the photos so they will open larger in Flickr.

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