In celebration of our new camera, Ricky and I went to our favorite dessert place after dinner, and then we started doing some testings. No flash was used.

ISO 6400 – the noise is acceptable to me and I know I will go up to 6400 quite often when shooting indoors.

Max ISO 25600 – as you can see the noise is very visible, but I love having that option there when I need it.
And the 24-70mm on a full frame makes a nice difference.