Thanks!
I took several opportunities to test my Nikon D750... upgraded from the D7100.
The full frame sensor is amazing, much better light gathering abilities and the 28mm to 300 zoom is heavy but very handy for most situations.
After dark on Cannon Beach, these were 25 and 30 second exposures pushing 3200 to 4000 ISO.
Too much light from the city caused some over exposures... time to get up in the mountains and far away from "light pollution" and do more testing.