I have had this lens for more than a year now and my experience is unfortunately quite mixed. I used it mainly for landscapes, with additonal filtering (Hoya Pro 1 D polarizer and Cokin P system).
- Weather sealed; - Sharpness; - Color accuracy
- Questionable durability/solidness (definitely in my case; - Poor flare resistance; - High level of chromatic aberration; - Needs the largest (and most expensive) square filters (vignetting is visible even with a wide-angle adapter for Cokin P system; - High price