Is This the Ultimate Portrait Lens?

The Sigma 135mm f/1.4 DG Art lens is a unique option if you want razor-sharp portraits with serious background separation. A lens this fast and this long offers something most other telephoto primes can’t: the creamiest blur combined with wide-open sharpness. It’s the kind of glass that makes you stop mid-shoot to review the files on the back of the camera because they just look that good.

Coming to you from Julia Trotti, this detailed video puts the Sigma 135mm f/1.4 DG Art lens through its paces for both stills and video. You see exactly what happens when shooting wide open at f/1.4, and the clarity is hard to miss. The rendering of detail and texture is impressive, but it still flatters skin tones in a way that makes sense for portrait work. Subject separation is immediate, and the background melts away in a natural way rather than feeling artificial. Trotti points out that the lack of image stabilization means you’ll need to lean on your camera’s IBIS or keep shutter speeds fast, but that’s typical for a lens in this category.

The autofocus test shows where the lens shines and where it falls short. Trotti notes that with Sigma’s dual HLA motors, it tracks subjects well at a distance, but closer focusing introduces some hesitation. That’s why she calls it a “photo first” lens, even though it produces beautiful video footage. When used for portraits with only small subject movements, autofocus is reliable and steady. If you’re hoping to use it for fast action or unpredictable motion, that’s where it begins to lag. For controlled setups, though, the results are strong and consistent.

Key Specs

• Focal Length: 135mm

• Maximum Aperture: f/1.4

• Minimum Aperture: f/16

• Lens Mount: Sony E, Leica L

• Format Coverage: Full frame

• Minimum Focus Distance: 43.3 in / 110 cm

• Magnification: 0.14x

• Optical Design: 17 elements in 13 groups

• Aperture Blades: 13, rounded

• Focus Type: Autofocus

• Image Stabilization: None

• Tripod Mount: Removable, rotating collar

• Filter Size: 105 mm

• Dimensions: 4.4 x 5.3 in (111.7 x 135.5 mm)

• Weight: 3.15 lb / 1.43 kg

Weight is one of the big talking points. At just over three pounds, this lens is far heavier than other 135mm primes, which are usually f/1.8 or f/2 designs. The trade-off is obvious: Sigma needed the size to house the bright f/1.4 aperture. Trotti suggests that event shooters may find it too heavy for long sessions, but portrait shooters working shorter bursts will appreciate the payoff in image quality. The lens also includes an aperture ring with a click switch, customizable buttons, a focus mode switch, and weather-sealing. The 105mm filter thread is massive, which makes filters costly and less practical.

Bokeh and flare performance are another highlight. With 13 rounded blades, the blur stays smooth and circular even as you stop down. Golden hour portraits show just how well the transition from sharp to soft looks, and the lens flare is described as soft, dreamy, and flattering. There’s some purple flare that Trotti suspects may be partly due to the Lumix body she tested on, but it didn’t detract from the overall look. Check out the video above for the full rundown from Trotti.