These are images taken at ISO 6400.
No noise reduction (apologies but I had to crop in more for the FW 1.10 no NR image as it exceeded the maximum size for uploading):
Low noise reduction:
Normal noise reduction:
There is a definite improvement in IQ of ISO 6400 in FW 1.10 compared to previous firmware, especially in the low and normal NR. This has always been the maximum ISO I use on the A7R, but with such an improvement in IQ perhaps I could use even higher ISOs – read on in Page 3.