The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 90mm F2.2 E and the Sigma 90mm F2.8 DG DN C for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Viltrox 90mm F2.2 E is the longer of the two lenses at 76mm. The Sigma 90mm F2.8 DG DN C with a length of 60mm, is 16mm shorter. Besides being longer, the Viltrox 90mm F2.2 E also has a larger diameter of 69mm compared to the Sigma 90mm F2.8 DG DN C's 64mm diameter.

Viltrox 90mm F2.2 E vs Sigma 90mm F2.8 DG DN C Lenses Size Comparison
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sigma 90mm F2.8 DG DN C weighs 295g, 7% (25g) lighter than the Viltrox 90mm F2.2 E's weight of 320g.
Filter Threads
The Viltrox 90mm F2.2 E has a filter size of 58mm whereas the Sigma 90mm F2.8 DG DN C has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Viltrox 90mm F2.2 E:
And these are the 55mm filters that we recommend for the Sigma 90mm F2.8 DG DN C:
Lens Mounts
The Viltrox 90mm F2.2 E has the Sony E lens mount whereas the Sigma 90mm F2.8 DG DN C has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sigma 90mm F2.8 DG DN C is also available in Sony E mount.
Focal Range
Both lenses have the same focal range of
90mm but while Viltrox 90mm F2.2 E has the fastest aperture of
F2.2, the Sigma 90mm F2.8 DG DN C's widest aperture value is
F2.8.