There's no way I'd swap my 150mm. F2.8 for anything. In it's range I doubt there's anything better.
I'll be honest, the ONLY thing holding me back from buying the 120-300 F2.8 is the fact I've never seen one let alone an image from one, at least not at full sized resolution.
It's a huge amount to spend on the say so of strangers!
Although I do have the seven day distance selling regulations to fall back on if I order one and find it not what I expected.
If I don't order one by tomorrow, I never will!! This indecision by me is so not my normal way, I normally gleefully buy whatever I want and often regret it later.
