They are not the same...
Base ISO is a separate thing from having a lower max shutter speed.
Just think of it this way, that an exposure of ISO200, 1/100s, F2.8 on D700 will also expose at ISO200, 1/100s. F2.8 on D600.
The advantage a lower base native ISO gives you, is that you can shoot at the best quality (lowest base native ISO) and get a longer exposure on a D600 than a D700. This advantage is best when shooting landscapes.
No doubt when shooting very bright scenes, you can go down to ISO100, but in a pinch D700 can also go down to ISO100... But you can never go 1/8000 on a D600.
But seriously, I have more of an issue with the max sync speed of D600 than its max shutter speed.
Unless you frequently do very high speed photography, most ppl's concern is for shooting large aperture on bright daylight. In this sense, on D600 you can just drop to its lowest ISO, which is 1 stop lower than D700 & you will be able to use the same aperture as u would on a D700 at 1/8000.
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