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no real budget!
just want something that works kinda like a Nikon film camera..Thinking about Nikon Df, D700 or sony A7(but the mount adapters are expensive..)
seafish-
no real budget
Does that mean that you do not really have money, or that you don't care how much it costs?
want something that works kinda like a Nikon film camera
Like I said a Nikon DSLR will get you close.
Of course there's still some learning to do (fundamental settings at least; colour, metering, files etc. but it's not rocket science).A camera with a "full frame" sensor (as big as the film negative, as opposed to a "cropped", smaller one) will allow you to use the lenses you have like you did on your film camera. Long story short: this is what you want. Nikon calls these cameras "FX" bodies.
The Df is one of those, albeit quite a niche (read: expensive) one, also it does not do video.
Keep in mind DSLR cameras are not really made for doing video anyway.Take a look at the D750 maybe.
salad
Get a digital Nikon SLR.
If you said what your budget is one could give more specific recommendations.