Finaly after a number of bad Sigma lenses, I have found one that is amazing. My first Sigma 120-400 model was very poor with bad focusing issues but the latest version, purchased this March 2012, is just as good as my Canon 100-400 L lens. Take a look at the samples below, I used a Canon 1DS MK III and an ISO of 320. The day was bright and my speeds were approx 500/s with an F stop of approx F8. I have had many Sigma lenses but the more recent models like the 85mm F1.4 and the 50mm F1.4 have had focus issues. The older Sigma lenses like the 15-30, the 12-24 and the 20mm F1.8 etc were great?
Does anyone know how to start a review on a lens not yet mentioned under the review section FM?