Who ever says that a 200mm f2.8 MFT lens is equivalent to a 400mm f2.8 FF lens should then agree that these two systems below are equivalent :
In fact, the Sony RX100 IV is even "better" since its lens is a 24-70 f1.8-2.8 which is faster than the 24-70 f2.8 on the Nikon.
The same could be said about a cell phone featuring a 28mm equivalent lens and f2.0 aperture vs a MILC with a 28mm equiv f2.0 lens.
It's just plain silly.
In fact, the Sony RX100 IV is even "better" since its lens is a 24-70 f1.8-2.8 which is faster than the 24-70 f2.8 on the Nikon.
The same could be said about a cell phone featuring a 28mm equivalent lens and f2.0 aperture vs a MILC with a 28mm equiv f2.0 lens.
It's just plain silly.