I have owned D800/810/850 and D7100/7200 and changed to Z buying a Z50ii. Terrible thing . Horrible menus with functions not available /no lock on focus position/no lock on selector dial/ terrible battery life / one card /stupid screen select button . just hate it so its gone and back to F mount
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Get to use Z lenses which are excellent
Better AF coverage
Useable silent shutter mode
No need for viewfinder blind
Useable (albeit slow) AF in very low light
Better viewfinder visibility in very low light
Lots of tracking / eye AF / etc AF modes
IBIS
FWIW, I am keeping feet in both worlds. I now have a D7500 (bought new to replace an old D7200 when Nikon recently deeply discounted it) with 10-24, 16-80 and AF-P 70-300 (FX) Nikkors for my compact/lightweight kit. The D7500 has great battery life, fine image quality, is very responsive and deals well with a lens change in bad weather (vs. all the Z cameras other than the Z8/Z9). Also, the shutter doesn’t get fried between exposures when pointed at the sun for an extended period of time (not counting Live View). I considered the Z50II but the limited battery life, lack of IBIS, and exposed sensor with the lens removed were deal killers.
A big attraction for Z for me is the consistently great lenses vs. the F mounts. The S lenses I now have (14-30 f/4, 20 f/1.8, 24-120 f/4 and 100-400 f/4.5-5.6) are a definite step up from the corresponding F lenses.
I loved the size/weight/image quality of my Z7 but I traded it for a Z8 to gain far better AF (better than the D500 I sold too), more low-light usability features and the shutter that can be closed for lens changes. Both the Z7 & Z8 feature IBIS, which I’ve found amazingly effective. Being able to review the photo I just shot in the viewfinder is often helpful, such as when out in bright sun. Now that I have quite a bit of experience with the Z8 ergonomics, I do prefer them to the DSLRs. So far, my aging brain can still deal with both the DSLRs and the Z8s.
I also still have my D800e for use with mostly Ai(s) lenses for fun.
Being a mostly landscape / wildlife shooter, these bodies serve me well. Definitely suppressed my GAS.