Being a wide angle shooter with an occasional penchant for portraits, this lens seemed to fit the bill for me and despite it's hefty price, I'm convinced of it's excellence. I simply cannot believe how razor sharp it is at 1.4 let alone 2.8. Despite comments I've read to the contrary, this has the sharpness/clarity edge on the 35 1.4 (and I rate that lens very highly). The shallow DOF at that focal length has a particularly 'journalistic' effect which is truly wonderful.
Just thought I'd put it out there at how chuffed I am.