Things just changed. Today Tamron introduced a new lens, and for the first time it's available immediately in the Sony FE and Nikon Z-mounts. Prior to this, we saw Tamron first introduce with the Sony FE mount, and then later offer some of those lenses in the Z-mount. If this simultaneous release stays true for future Tamron introductions, it says something about the current state of the mirrorless mounts. (Canon has not approved any full frame autofocus lenses for the RF mount yet, a policy that's still giving their users grief.)
The new lens is the rebirth of the famous 90mm f/2.8 Macro lens, with a number of redesign bits that make it better than its DSLR predecessor, both optically as well as in usage. In particular Tamron points to the better flat field performance as well as the 12-blade aperture diaphragm for the former, with new buttons, hood design, and focus ring torque for the latter.
The Tamron 90mm f/2.8 Macro now provides an alternative to the 105mm f/2.8 Micro-Nikkor, at a lower cost (US$699) and using Tamron's standardized 67mm filter sizing. This brings to six the number of Tamron lenses available in the Z-mount (nine if you count the Tamrikons), making Tamron easily the first of the traditional third party lens makers to "fully" support the Z-mount.
