Even if I do not want to buy a new camera (did buy too much), I'm still working on a plan for replacement (foreseen spring 2017). Budget was set at 1200€, mainly based on a second hand Nikon D750, which was well received for me, low light and sport focusing, Full Frame ISO behaviour, 24mp (more then I have now), ... Frame rate is not my thing and more megapixels was also not a priority (I like my 6 mpix D70s just fine).
I might be changing my vision:
- rumor on the Sony E mount adaptor that would do focusing with Nikon Lenses (seems prototype tests ongoing)
- A7R II which seems to have a lot of features, including a focusing capability above DSLRs according to dpview.
Analysis: Sony a7R II and RX100 IV autofocus systems: Digital Photography Review
the budget question: I would expect the Sony + adapter to come to 2000€ second hand in 2017, which would probably give me a Nikon D4 at that time.
The D4 is a very capable machine, does it loose from the A7R II?
I think so, A7R II:
- smaller (even if the lens will detemine much of the volume on FF)
- super BSI sensor (to be confirmed in use and tests, but probability is high)
- super auto focus (hopefully version 3 for the Nikon adapter will be out in 2017), larger coverage and good combination phase and contrast detection
- more cross type points => believe I got that wrong, no cross type in A7RII
- super IBIS stabilisation (see A7II reviews)
- more crop possibilities and details available (42mpix BSI)
=> where the A7R II will still be stuck is battery life, but for me that is not major. I hope large files will not be blocking; laptop is foreseen for spring 2016.
I'll admit that a lot is still promises, but Sony starts to build a reputation of delivering on those.
Speaking of too many MP, I have a buddy who started out with a D7000 then bought a D800 but continues to use DX lenses because he likes the small (16MP) small file size. Go figure.
A D800 has other layout, measuring systems, etc... it might be worth it. But seems a waste for most applications.