for what you upgrade you camera? are you profesional photographer? if yes, yup you must have a FX camera,
Why
must a professional photographer have an FX camera? It's that kind of unsubstantiated thinking that causes people to upgrade camera bodies expecting a huge difference in their image quality. QUOTE
My definition of a Pro is someone who does something for money.
I use Professional equipment because it gives me more good pictures quicker.
However, those with a D70 used to make more money than I did with a D1.
Now they use a D7000 (DX) instead of the D3 (FX) because their investment is much lower.
And I use one because I can no longer hand hold the D3 for 8 hours at an Event.
It is only the top end Studio Professional that needs a D3x or Hasselbad.