Summary: I read reviews about this lens quite a lot. I already have a 70-200 F2.8 VRII. I compare shots between this lens and my prime 20mm F2.8. Quite surprised that the lens is sharper than my prime. I have checked a couple of times, exactly the set up and on the same D700 body. I decided to buy this lens instead of using my 20mm prime as in cramped social events, there is no room to move forward or backward to get a good picture of everyone in the table.