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I got this as a treat for myself to replace my Nikon d600. This camera is excellent across the board, especially when coupled with the ftz adaptor for my existing F mount Nikon lenses. Autofocus is fast and on point-. The eye detection for both pets and humans works well. The sensor has low noise at high ISO and the built in image stabilization on the sensor will bring your photos to a new level of focus. Battery life I find to be better than most of the early reviews indicated and the mirrorless system makes for a quieter more response camera. If I could suggest one improvement it would be that there be some type of device to protect the sensor from dust when your changing lenses. But other than that I expect to be using this camera for years to come.
The camera body felt a lot lighter than my D750 BUT when you add lenses and an L-bracket it is still hefty. It would be interesting to see how heavy it is with the new Z lenses Nikon is starting to put out. The good is that is has an adapter which allows use of all the Nikon lenses I use on my other cameras. Nikon eliminated the "scene" and "effects" selections which I had fun with once and awhile. There are some creative setting found under the "picture control" selection. They added a "U3" button. There are two FN buttons which default to white balance and AF area mode selections. For me they are ergonomically difficult. The good news is you can customize many settings in other places so I will not be using these two buttons at all. I also didn't like pushing down the ISO button and having to twist one of the command dials. Research amongst the forums and manual revealed that you can adjust some settings so you can push down and release the ISO button and then use the command dials which makes it much less cumbersome. The Z6ii model compared to the Z6 has two slots for memory cards. And of course, the CFexpress memory cards are pricey. Some users may just be happy using the SD card. The camera also does not have a pop-up flash like the D750 which I found useful. At the time of this writing I can't comment on quality of photos and other techie stuff. I need more practice and there's been too much smoke here to make image taking fun. In general I felt the learning curve between the D750 and Z6ii was not steep. Definitely quieter with no mirror noise. If you like playing with wifi, you can download Snapbridge which allows shooting with a tap of your phone which can come in handy. There are many fine cameras out there and different reasons to chose one over another. Do your research, assess your needs. Remember good glass may be a better investment than a new camera. And, as I tell myself the newest and best camera doesn't make one a good photographer. Study, practice, practice and more practice.