Love the D850 and just got the 500pf. I have too much invested in nikon gear. I don't have the need for a mirrorless camera yet. I feel confident that Nikon mirrorless will be up to par with Sony and Canon in the near future.
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I voted that I would probably not switch. (Note, I’m not saying I never would, depending on what happens.) I have had a Nikon for over 40 years, starting with a Nikkormat and 50 m f2 lens in high school. I currently use the Z6II, Z7II, D850 and D500, along with a number of Z mount lenses and F mount lenses.
When I got a Z7 a couple of years ago, it felt like a Nikon and the menus and options were familiar. While there was much new to learn, especially for autofocus, that “Nikon-ness” was appealing to me.
I have a number of Nikon lenses in Z mount and F mount. I like the Z lenses a lot and now mostly use Z mount lenses from 14 mm to 200 mm. In F mount, the 19 mm PCE, 70-300 AF-P FX, 300 m PF, 500 mm PF and 200-500 mm lenses are excellent lenses too and work well on both my DSLRs and Z bodies. It would be expensive to shift and at the moment, I do not see any equivalent to the PF lenses from other manufacturers. The 500 mm PF is my favorite and most used lens. It pairs well with the Z7II (or Z6II) as a light-weight and maneuverable kit for wildlife, especially when kayaking, canoeing, walking, hiking or traveling.
I find the Z7II and Z6II are quite good for most wildlife, as well as landscape and more general shooting. Not the best for BIF, so I kept the D500 and D850 for now. However, the ZIIs are better for action and BIF than many think and I now mostly use my Z bodies rather than my DSLRs.
I am looking forward to the 100-400 mm in Z mount. I would love to see a 400 mm f4 PF or 600 mm f5.6 PF in Z mount. I suspect the currently planned 400 mm f2.8 and 600 f4 in Z mount will be heavier/larger than I want. I will also consider the Z9, as it could be a do-everything body for me. Size and weight of the Z9 will matter to me.
I suspect that Sony and Canon owners have their own set of issues, complaints and wish lists for improvements, although I am not sure what they are.
Rather than switching, I suspect adding another system would be more likely. A Fuji medium format system, if I wanted something better for landscapes? A Sony A1, if Nikon continues to lag on AF for BIF and fast action?
I switched from Canon in 2016 after using them for 20+ years. I went to a Fujifilm X-T2 and loved it except for battery life and the fact that the weight wasn’t that much less once I added the 100-400mm lens, extender and battery grip (a necessity because of short battery life). So, when I decided to go back to a DSLR, I decided to try out Nikon (why not, since I had sold all of my Canon gear) and have been with them since 2017. I voted that I would be open to switching because I still yearn for the simple dials on the Fuji or a lighter rig to carry around for long birding trips.