Hi everyone, I have wanted the 100mm f/2 for so long now and, due its high cost and scarcity, I am considering the f/2.8. My question is how much of an imporvement is the f/2 over its slower cousin? Is it just faster or is there are noticeable improvement in sharpness and bokeh? Do you think it is worth waiting until I can afford my dream lens? Cheers!