darkref

And sensor size. A larger sensor gathers more total light. The light intensity is the same for different sensor sizes, which implies that the total light gathered by a larger sensor is larger.

We would have said the same thing about ISO 3200 and 6400 10 years ago. Now those ISOs are usable on many cameras.

There are plenty of reasons to go full frame other than good high iso performance.

Click the "Comp" button at the top of the comparison tool. You want to compare the photos at the same resolution. If you do that and go back to the scene you will find that the D7200 has by far ...