The important thing is that the Sigma blows the Sony/Zeiss and the Nikon out of the water and back into more water. It is amazing. Bravo Sigma for again showing other companies how it's done.
This is a great time to point out the review of the Nikon 58mm lens at Lenstip. You can always spot a good review website when they really let harsh words fly when they are called for. Most websites are terrified of pissing off the companies that buy advertising space, meaning that bad products rarely get the reviews they deserve.
The Nikon 58mm is an overpriced piece of crap, and their review says it all.
Perhaps I am naive but I admit when Zeiss announced their Otus 1.4/55 and Nikon – the Nikkor AF-S 58 mm f/1.4G I though we were going to deal with two lenses which were a match for each other. It seems, though, that only Zeiss was serious about it and Nikon was joking all along, trying to sell you a rough piece of trash for a lot of money under a cover of a storied Nikon legacy. I really don’t intend to torture the tested Nikkor any longer because it is not worth the time and trouble.This is why Oly and Panasonic piss me off so much. This is their fantasty! This is their goal! They want to be able to have such control over their closed system that they can charge comically huge prices for garbage and pad their profits on the backs of those who bought their cameras. It's bad enough that we have two companies doing this (Canon's included). The last thing we need is two more.