As good as any native lens on the A7r3

Eye autofocus works even in the worst light with this lens. It is tack sharp wide open at f1.8 and requires no stopping down to guarantee focus even in terrible conditions. The resolution is easily good enough for the 42 megapixel sensor.

Durable; Great Picture Quality; Simple Controls

Bulky

In comparison, it's a different lens from the Sigma 85mm f1.4 Art lens but probably not enough besides focal lengths.

Sigma's range of Art lenses has catapulted the company into the upper echelons of lens production, and the 135mm f/1.8 demonstrates the appeal of the series beautifully.

Sigma 135mm f/1.8 DG HSM Art Lens Review

As with many of the other 11 Sigma Art lenses before it, the Sigma 135mm f/1.8 DG HSM Art Lens arrived to a solid anticipation. Sigma has primed that anticipation by continually delivering great-performance in the Art lens lineup and who doesn't love the optical specs of this lens

Sigma 135mm F1.8 DG HSM Art Review

Sigma's Art series of lenses has established itself as a go-to third-party option for photographers thanks to excellent optics and, for the most part, very attractive prices. The 135mm F1.8 DG HSM Art ($1,399) delivers on image quality, but it's also as (or more) expensive than the closest lenses from Canon and Nikon. Thankfully it backs up its price with phenomenal performance, so we're naming it our Editors' Choice for photographers shopping for a prime lens in this focal length. Design The 135mm F1.8 ($1,297.70 at Amazon) is fairly squat, about 4.5 by 3.6 inches (HD), but very heavy for its size, at 2.6 pounds. Its front element is big, supporting 82mm filters. Sigma includes front and rear caps, a reversible hood, and a soft carrying case. The lens itself is available in versions for Canon (EF), Nikon (F), and Sigma (SA) cameras. The outer lens barrel is metal, sturdy and cool to the touch. Sigma includes a seal at the mount point in the design, and promises that the 135mm is...

The Sigma 135mm F1.8 DG HSM Art is a lens that portrait photographers will adore: It blurs backgrounds with aplomb and is one of the sharpest we've ever tested.

Razor sharp; Wide aperture; No distortion; Minimal falloff; Dust- and splash-proof design; Focus limiter switch; Available for Canon, Nikon, and Sigma systems

Quite heavy; Expensive; Omits optical stabilization; May require focus adjustment