I have owned the 150/2.8 for quite sometime, it is an amazingly sharp lens. It surely takes care of all macro shots I'll ever need.


However, I'm not sure you will be satisfied or not if you're going to use this lens for general purpose or portrait. I personally found that 150mm on a 1.6x body is a bit too long for portrait, even head&shouder shots. For general purpose, just keep in mind that the Sigma's autofocus ability is far behind Canon's, it will suffer in low light for sure; even in good lighting condition it's not even as fast and consistent. I once tried to use this lens for sport, it was hard. One last thing, the vignette will not go away no matter how you stop this lens down on a FF body.


So overall i think the Sigma is more dedicated to macro as it offers amazing sharpness and a long enough working distance. I don't use it much beyond macro applications.


Reagrds,


Ben