To provide photographers with a broader perspective about mobiles, lenses and cameras, here are links to articles, reviews, and analyses of photographic equipment produced by DxOMark, renown websites, magazines or blogs.
The Sony FE 100mm F2.8 STF GM OSS is a short-telephoto prime for Sony full-frame mirrorless E-mount cameras such as the high-end a9 and the earlier A7 models. Besides being a G-Master model with high-grade optics and build, it has number of interesting features that make it stand out as a highly specialized lens for portraiture. First is the inclusion of optical image stabilization, which can be used to complement the camera’s sensor-shift stabilization (where applicable); and second is the use of an apodization filter or APD element as part of the optical construction.
The Sony FE 85mm F1.8 is a high-speed standard prime for Sony full-frame E-mount cameras such as the A9 and A7 cameras, but will also fit smaller “cropped” sensor APS-C models such as the A5000, on which it offers an equivalent field of view of a 130mm focal length.
One of three new lenses announced as part of Sony’s new no-compromise G Master series for full-frame a models, the new FE 85mm f1.4 GM sounds highly promising. Though it carries a hefty price premium — the new model will set you back close to $1,800 — it features cutting-edge optical technology.
Featuring a whopping 42.4Mp resolution, the Sony A7R II mirrorless camera is one of the highest-resolution consumer cameras currently available. It’s also currently the only camera to feature a full-frame 35mm BSI (backside illuminated) sensor — technology that allows the photocells to capture a greater intensity of light, and in theory, maximize image quality.
Carl Zeiss’s latest range of Batis lenses has been specifically designed for the Sony A7 series of full-frame mirrorless cameras such as the Sony A7R II and Sony A7S II. Together with the legendary optical precision and outstanding build quality for which Carl Zeiss lenses are known, the new Batis lenses also feature autofocus and an innovative OLED display on the lens barrel that gives both focus distance and depth-of-field information. The first new lenses released in the Zeiss Batis lineup are the 25mm f/2 wide-angle prime and 85mm f/1.8 short telephoto prime.
This lens is just useless in some environments (e.g. studio, indoor shooting with av. light) if you use an A7RII or A7SII. There is a focussing bug in the camera's firmware that makes the iris stay closed while you focus even if preview of settings is switched 'off'. Focussing with F8-11 is just impossible in dim light conditions. It takes an eternity to lock on and often fails. This makes this lens quite useless for any professional work. Sony really needs to adress this.
Sony's FE 85mm F1.4 has Otus-grade autofocus performance, I guess :)
The Sony FE 85mm F1.4 GM is verifiably less sharp than the Zeiss Otus 85mm F1.4, it just isn't obvious when the Otus is used on FF cameras with 36 MP resolution or less.
The difference in sharpness will most likely remain purely academic though. For real-life applications, it might be more interesting to look at features that are ignored by DxOmark, like e.g.: Ghosting, flaring, coma, color fringes around out-of-focus objects (LoCAs).
I don't think that Sony's glass can hold a candle against Zeiss' Otus. Except of course, when it comes to autofocus performance :)
Why not to compare on the same sensor? https://www.dxomark.com/Lenses/Compare/Side-by-side/Sony-FE-85mm-F14-GM-on-Sony-A7R-versus-Zeiss-Carl-Zeiss-Apo-Planar-T-Star-Otus-85mm-F14-ZF2-Nikon-on-Nikon-D810__1680_917_1384_963 The Sony is quite far for the Otus...