This post is part of the 2019 Engadget Camera Guide providing information about what to buy, and how to get the most from it.
Sigma 85mm f/1.4 DG HSM Art Lens for Sony E
Sigma only recently launched lenses for Sony's full-frame E-Mount system, but it was worth the wait. At $1,199, the Sigma 85mm f/1.4 DG HSM Art Lens is $600 less than Sony's G-Master FE 85mm f/1.4 model, but offers excellent performance, with tack-sharp, distortion-free optics -- even wide open. Build-quality is excellent and autofocus is quick and reliable. The main drawbacks when compared to Sony's GM lens are the lack of weather sealing and heavy weight.
Sony FE 28mm f/2
It's safe to say every photographer and videographer needs a prime lens, and you simply can't go wrong with the Sony FE 28mm f/2. As is the case with most pancake lenses, the greatest benefit of owning an FE 28mm f/2 is how compact it is. In addition to that, it's a good lens to have for shooting in low-light conditions, while its f/2 maximum aperture can help you take some great bokeh shots. And best of all, it's only $450.
Sony FE 16-35mm f/2.8 GM
Sony designed the G Master lenses with its full-frame mirrorless cameras in mind, and if you're going to want any glass for an A7III or A9, the Sony 16-35mm FE 16-35mm f/2.8 GM is a great place to start. Sure, it's $2,200, but this wide-angle lens is perfect for photographers who want to take wide, closeup shots. The f/2.8 aperture will ensure you get great bokeh effect, aka a perfectly blurred background, and you also won't have to worry about the edges around your shots not being perfectly rendered.
Sony FE 24-70mm f/2.8 GM
More often than not, there's no wow factor to standard zoom lenses. But that's not necessarily the case with the Sony FE 24-70mm f/2.8GM lens, which is designed to be ideal for portrait and travel photography. The best feature of this G Master glass, without a doubt, is the ability to keep the same exposure and depth of field even at its widest aperture of f/2.8. That should give your great level of bokeh, a signature feature of all G Master lenses, including the FE 16-35mm f/2.8 GM. Like that lens, the FE 24-70mm f/2.8 GM is also priced at $2,200.
Sony FE 24-105mm f/4 G OSS
While the G Master FE 24-70mm f/2.8 GM and FE 16-35mm f/2.8 GM lenses may be extremely sharp and give you great depth of field, they are not as versatile as the Sony FE 24-105mm f/4 G OSS. That said, the FE 24-105mm f/4 G OSS is helped by the fact it can maintain its maximum f/4 aperture, ensuring that you get the sharpest shots regardless of how far you're zooming in or out. At $1,400, it's not a cheap piece of glass by any means, but it's a great starter to pair with your Sony Alpha mirrorless camera.
Sony Planar T* FE 50mm f/1.4 ZA Lens
Sony's Zeiss branded lenses are always a good bet for its full-frame cameras. While a bit heavy and cumbered with a slow, noisy focus motor, the Sony Planar T* FE 50mm f/1.4 ZA offers great speed and optical quality. Most importantly for a portrait lens like this, it produces spectacular-but-soft bokeh. We've used the Planar T* a lot on a Sony A7R III, and it always makes subjects look their best. If the $1,498 price tag is too rich, take a look at Sigma's 50mm f/1.4 DG HSM Art E-mount full-frame lens.