Sigma has been really cruising the last few years, but it seems they've outdone themselves with their 105mm f/1.4 Art lens. Check out this awesome review of this sharp piece of glass.
Coming to you from Manny Ortiz, this great video gives his review of the Sigma 105mm f/1.4 DG HSM Art lens. I personally have had the Sony version of this lens for a few months now and can definitely attest to how stunningly sharp it is, even on my high-resolution a7R III. It's undoubtedly heavy, but it does balance in my hands fairly well, and autofocus has been quite good, much better than I'm used to with Sigma lenses on my Canon gear. When you consider just how much optical quality you're getting for the price, it really is an awesome bargain, especially for a wide-aperture portrait lens that can take advantage of Sony's awesome Eye AF, which tends to give me a much higher keeper rate than my old portrait setup, which was an 85mm on my Canon DSLRs. And as Ortiz mentions, the built-in adapter actually gives some nice clearance around the camera grip. If you're looking for a portrait lens for your Sony camera, I definitely recommend it. It's also on sale right now; you can get yours for $100 off right here.