As others have noted, there are a lot of mixed reviews on this lens. And had I read them first, instead of actually trying the lens out, I might have hesitated and not bought this one. Instead, after actually trying it, I bought it and I am glad I did. The lens I got is very sharp and has great color and contrast. I didn't buy it here on FM's Buy & Sell forum but, instead from a local camera shop. So, I paid $650.00 plus tax. Total, slightly over $700.00 . But, I had the chance to try it out and I really do like this lens. It is my first non-Canon lens that I feel is close, if not equal to Canon L quality.
I have since seen two different sellers here, selling this lens for less than I paid for mine. Knowing what I know now, I would recommend to others to give this great lens a chance.
You won't be disappointed.