D600 vs a99 .... why?

That's for sure.

Precisely, as the "challenger", i used to think that Sony should have a more aggressive pricing strategy. I remember the "early days" (2006) when they released the A100 which, at that time, was considered a very attractive camera for a small amount of money.

But nowadays, paradoxically, one may consider that Nikon has a more aggressive strategy than Sony on the FF segment.

This may not encourage photographers (sometimes a bit conservative) to switch brands to the advantage of Sony...

Well, that is my opinion.