The Sigma 105mm f/1.4 is absolutely massive with a filter thread size the same as its focal length and weighing enough to warrant its own tripod mount. Does the extra size and weight make it a better option than Nikon's own 105mm f/1.4 lens?
Sigma's Art series has become synonymous with quality at a lower cost. My own experience with their Art lineup is that the lenses are generally heavier than their competition but cost significantly less, sometimes they even shake up the entire market. How much is too much weight though? Matt Granger takes a real-world look into the Sigma's newest lens and compares it to Nikon's relatively new lens in the same category. At nearly $1,600 the Sigma is not inexpensive by any means but it is $600 less than the Nikon equivalent. The lens is also available for both Canon and Sony mounts which adds some unique choices for anyone in the market for a new portrait lens.
The results are quite impressive but is the extra weight and lack of internal stabilization worth the price difference? If you aren't shooting on Nikon, is this a portrait lens you'd consider? I would love to hear your opinion in the comments or your current favorite portrait lens.