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Sharpness 
Overall, the 85mm ƒ/1.4 GM lens is capable of very sharp images on both full-frame and APS-C Sony cameras, especially if you stop the lens down a bit. Given the very wide ƒ/1.4 aperture, it's not very surprising to see some softness out away from the center of the frame, especially on a full-frame camera. Despite the corner softness at ƒ/1.4, the center of the frame is very sharp. Stopping down, even only a few stops, sharpens things up considerably, noticeably in the corners. Around ƒ/4-5.6 on either a full-frame or sub-frame camera, the lens is practically tack sharp across the entire frame. The lens maintains a nearly flat sharpness characteristic across the entire frame throughout the remaining apertures. We did observe minor diffraction-related softness by the time you stop all the way down to ƒ/16, but the effect is quite minor on both full- and sub-frame cameras.

Chromatic Aberration 
The Sony 85mm ƒ/1.4 GM does very well at controlling chromatic aberration, even at ƒ/1.4 on a full-frame camera. While we measured slight variations between the amount of CA throughout the aperture range on both full-frame and APS-C cameras, on a whole, maximum CA never rose above three hundredths of a percent of frame height. On average, CA on both sensor sizes was very low, with only minor, easily-correctable magenta and cyan fringing visible on high-contrast edges in the corners at wider apertures.

Conclusion

The Sony 85mm ƒ/1.4 GM lens is the start of a new chapter for Sony lenses, a new tier of ultra-premium, professional-grade lenses. Sony claims the new FE-mount 85mm ƒ/1.4 G Master lens is the "ultimate portrait lens," and after our testing they just might be right. While it costs a pretty penny, this is a lens aimed at professional photographers, in a similar vein to, say, Canon L-series lenses, and it offers top-notch image quality. This lens is very sharp -- though watch out for some corner softness on full-frame at ƒ/1.4 -- and it also shows excellent distortion and CA control. Its build quality is also fantastic, and it actually appears to be properly weather-resistant with a gasket seal around the lens mount! Though it's quite big and heavy, it nevertheless balances well on both Sony A7-series cameras and smaller bodies like the A6300. If you're a professional or advanced enthusiast and shoot with Sony equipment and need a true fast-aperture portrait lens for your next wedding, portrait session or editorial project, this premium 85mm G Master lens is definitely worth considering.