Sigma 85mm F1.4 DG DN Art vs Sony FE 20-70mm f/4 G
The bottom line
These cover different focal lengths — the Sigma 85mm F1.4 DG DN Art is 85mm, the Sony FE 20-70mm f/4 G is 20-70mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 85mm F1.4 DG DN Art for short-telephoto / portrait, the Sony FE 20-70mm f/4 G for standard zoom.
Choose the Sigma 85mm F1.4 DG DN Art if…
- ✓You want more light and background blur — f/1.4 is faster than f/4, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — an 85mm prime over a zoom.
Choose the Sony FE 20-70mm f/4 G if…
- ✓You shoot wide — it starts at 20mm vs 85mm for landscapes, interiors and architecture.
- ✓You want one-lens flexibility — a 20-70mm zoom covers what the fixed 85mm can't reframe.
- ✓You value portability — at 488g (1.08 lb) it's lighter than the 625g (1.38 lb) alternative for travel and all-day carry.
- ✓You like close-focus work — 0.39x magnification vs 0.12x.
Where they differ
- ›Aperture: the Sigma 85mm F1.4 DG DN Art opens to f/1.4 vs the Sony FE 20-70mm f/4 G's f/4 — more light and shallower depth-of-field.
- ›Focal range: Sigma 85mm F1.4 DG DN Art is 85mm, Sony FE 20-70mm f/4 G is 20-70mm — different framing and reach.
- ›Type: the Sony FE 20-70mm f/4 G is a zoom (flexible framing), the Sigma 85mm F1.4 DG DN Art a prime (one focal length, usually brighter and lighter).
- ›Close-up: the Sony FE 20-70mm f/4 G reaches 0.39x magnification vs 0.12x — more for close-up and macro work.
- ›Weight: the Sony FE 20-70mm f/4 G is 488g (1.08 lb) vs 625g (1.38 lb) — you'll feel the difference handheld.
Frequently asked
Is the Sigma 85mm F1.4 DG DN Art or the Sony FE 20-70mm f/4 G better?
These cover different focal lengths — the Sigma 85mm F1.4 DG DN Art is 85mm, the Sony FE 20-70mm f/4 G is 20-70mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 85mm F1.4 DG DN Art for short-telephoto / portrait, the Sony FE 20-70mm f/4 G for standard zoom.
Who should choose the Sigma 85mm F1.4 DG DN Art?
Choose the Sigma 85mm F1.4 DG DN Art if you want more light and background blur — f/1.4 is faster than f/4, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — an 85mm prime over a zoom.
Who should choose the Sony FE 20-70mm f/4 G?
Choose the Sony FE 20-70mm f/4 G if you shoot wide — it starts at 20mm vs 85mm for landscapes, interiors and architecture. Choose it if you want one-lens flexibility — a 20-70mm zoom covers what the fixed 85mm can't reframe. Choose it if you value portability — at 488g (1.08 lb) it's lighter than the 625g (1.38 lb) alternative for travel and all-day carry. Choose it if you like close-focus work — 0.39x magnification vs 0.12x.
What is the main difference between the Sigma 85mm F1.4 DG DN Art and the Sony FE 20-70mm f/4 G?
Aperture: the Sigma 85mm F1.4 DG DN Art opens to f/1.4 vs the Sony FE 20-70mm f/4 G's f/4 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 85mm | 20-70mm |
| Lens Type | Prime | Zoom |
| Optical Elements | 15 | 16 |
| Optical Groups | 12 | 13 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/4 |
| Minimum Aperture | f/16 | f/22 |
| Aperture Blades | 11 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 29° | 94° – 34° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | XD Linear |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 85 cm | 25 cm |
| Max Magnification | 0.12x | 0.39x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | Yes |
| Declickable Aperture | Yes | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $1,099 | $1,099 |
| Filter Size | 77mm | 72mm |
| Diameter | 82.8mm | 78.7mm |
| Length | 118mm | 99mm |
| Weight | 625g (1.38 lb) | 488g (1.08 lb) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
