Sigma 35mm f/1.4 DG II Art vs Tamron 35-100mm f/2.8: which to buy

This isn't a close call between two similar lenses so much as a choice between two philosophies that happen to share one focal length. The Sigma 35mm f/1.4 DG II Art is a fast single-focal-length prime; the Tamron 35-100mm f/2.8 is a short-telephoto zoom that starts where the Sigma sits and reaches well past it. Both land in our pro tier with matching scores of 82, both weigh almost the same (the Sigma is 525g, the Tamron 565g) and both even take 67mm filters, so the spec sheet won't break the tie. What breaks it is two things: the aperture-versus-range question, and a mount overlap that's narrower than it first looks.

Check your mount before anything else. This is the trap most people miss, because these two do not live in the same mounts. The Sigma 35mm f/1.4 DG II Art ships in Sony E and L-mount (Panasonic / Sigma / Leica). The Tamron 35-100mm f/2.8 ships in Sony E and Nikon Z. So the only mount where you actually get to choose between them is Sony E. If you shoot Nikon Z, the Sigma isn't an option and the Tamron wins by default; if you're on L-mount, the Tamron isn't offered and the Sigma is your pick. Sort the mount question first and, for a lot of buyers, the rest of this comparison is moot.

Pick the Sigma 35mm f/1.4 DG II Art if you want the widest aperture and a single, deliberate angle of view. At f/1.4 it gathers roughly two stops more light than the Tamron's f/2.8 and renders a far shallower depth of field, which is the whole reason to buy a fast prime: low-light interiors and events without cranking ISO, environmental portraits with real subject separation, street work, and astro. It's the 2026 successor to Sigma's iconic original 35mm Art — Sigma's pitch is that it's smaller and sharper than the lens that defined the category. You commit to one focal length and move your feet, and in exchange you get a look a zoom physically cannot reproduce. It typically sits a tier above the Tamron on price, but on a system like Sony E where Viltrox and Samyang sell competent 35s for roughly half the money, you're paying specifically for that Art-grade rendering and the f/1.4 ceiling.

Pick the Tamron 35-100mm f/2.8 if flexibility matters more than that last two stops of light. One lens covers wide-normal (35mm) through short telephoto (100mm), which is genuinely the more useful tool for events, weddings, run-and-gun video, and portrait sessions where the working distance keeps changing and you can't stop to swap glass. The constant f/2.8 holds across the whole range, so exposure and depth of field stay predictable as you zoom — that consistency is exactly what a fast variable-aperture kit zoom can't give you. It's also the cheaper of the two, so on Sony E you get more focal range and spend less up front (the Nikon Z version carries a small premium over the E variant); you're simply trading the prime's brighter aperture and shallower look for the freedom to recompose without lifting a second body.

The trap to avoid: treating these as interchangeable because the scores and tier line up at 82 / pro. They solve different problems. If you already know you want the 35mm look and crave that f/1.4 separation in low light, a zoom will never replace it — f/2.8 at 35mm is a different image. And if you need to reach a head-and-shoulders portrait at 100mm or cover a fast-moving scene, no 35mm prime will get you there, period. The scores being equal is the site telling you both are excellent at what they do, not that they're substitutes.

Bottom line: decide your mount, then decide whether you're buying an aperture or a focal range. On Nikon Z the Tamron is your only pick here; on L-mount it's the Sigma. Where you genuinely get to choose — Sony E — go Sigma if your work is built around shallow depth of field and shooting in the dark at one focal length, and go Tamron if versatility and a single do-it-all event lens (for less money) matter more than that f/1.4 ceiling. Match the tool to how you actually shoot and the price gap stops being the deciding factor.