Thanks for the feedback Luka and Charles. You know Charles I realized this morning when I asked you about the Sigma, I had temporarily forgotten about the 105/1.4!!!! Then i realized the 150mm I wouldn't be happy with as a portrait, so I think I'll save the pennies for the 105mm and the 200-500.
I've looked at the 300mm and it looks great certainly, and that's been one big consideration is to whether get the 300 PF and a 1.4x or the 200-500.
I like to hike (when I get a chance, which seems more rare these days) and I can't imagine lugging the 200-500 very far.