The Sony FE 135mm f/1.8 GM lens is renowned for its exceptional sharpness, often cited as one of the sharpest lenses available for Sony E-mount full-frame cameras. Its high resolution and excellent optical performance make it a top choice for photographers seeking unparalleled image quality.

If you need a super sharp zoom lens, check out the Sony FE 24-70mm f/2.8 GM II. This pro-grade standard zoom is among the sharpest zooms I've ever used on a full frame camera, mirrorless or DSLR. Throughout the focal range, even at f/2.8, it produces extremely crisp, high-contrast images with edge-to-edge sharpness. It's built like a tank and the constant f/2.8 aperture gives you flexibility for depth of field control and low light shooting. It's pricey but worth every penny if sharpness is critical.

Re: "The Sony FE 135mm f/1.8 GM lens is..." - it really is the technical peak for the system. If you look at the MTF (Modulation Transfer Function) data, the Sony FE 135mm f/1.8 GM shows nearly 100% contrast at 10 lp/mm and stays incredibly high even at 30 lp/mm across the entire frame. Most lenses drop off at the edges, but this one stays almost flat. The sharpness comes from the XA (extreme aspherical) elements which are manufactured with 0.01-micron surface precision. That keeps the light path extremely clean. When I look at Imatest results, this lens basically out-resolves current high-res sensors. Tbh, you wont see its full potential unless you're using a high-density sensor like the Sony Alpha 7R V. It's basically a piece of lab equipment disguised as a portrait lens.

As of now, the sharpest lens available for Sony E-mount full-frame mirrorless cameras is the Sony FE 50mm f/1.2 GM. This lens stands out for its exceptional optical performance, offering unparalleled sharpness even at wide apertures. It features advanced optics with three extreme aspherical (XA) elements and a Nano AR coating to reduce aberrations and enhance contrast. The 50mm f/1.2 GM's autofocus is quick and accurate, making it ideal for both portraits and general photography. Its ability to deliver crisp, clear images with superb detail across the frame makes it the top choice for discerning photographers.

Waiting for soon to be announced Sony FE 85mm f/1.4 GM II lens.