i reviewed every page on this thread up to about 400, it is a special lens, and i was seriously on the fence about getting it, but im not. I read a bunch of reviews and from what i have gatthered is:
its sharper in the center than canon 1.4 and 1.8 up to a point, but then edge sharpness isnt as good as the canons. Im not sure of the percentages but the lens could definitly have focus issues. Comparisons between canon 1.4 and this one said that beyond 20-30 feet, he was getting about 10% in focus when the lens worked great at close range. With sigma comming out when a new art 50 and canon looks like comming out with a 1.8 image stabilized 50, im gunna wait.
Man ! I am in the exact same position...The awainting makes me go crazy !!