|
Difficult to answer this one.
Financially it's a massive step. The 24-70 is expensive, but there's good reason for that.
It's worth thinking about the DX/FX issue here too, but that shouldn't put you off buying the lens if you decide to do so.
The biggest advantage of upgrading this lens would be the 24-70mm range over the fixed 50mm.
Ultimately it's down to you to decide, bearing I'm mind the finances, and what you need it for.
Good luck.
|