I guess that the purpose of this thread is to test your eye power.
If you crop to 100%, it would be quite easy to spot which ISO level was selected.
By not cropping, it is extremely difficult to know what ISO is using given that the noise level is well controlled. The noise level is well controlled in this aspect. :thumbsup:
This further illustrates that if you were to print this picture, you will not able to tell whether it is at ISO 800 or 6,400 easily.
How many times you print in large format so that you can see the noise level?