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Short answer: no.
Sigma and Tamron are both popular manufactures of third-party lenses that are used by Nikon DSLR shooters. But customers of the two brands may have different experiences migrating their lens collections over to Nikon’s new Z Series mirrorless ecosystem.
Sigma lens owners shouldn’t have any issues with the switch. The company released a statement in late September 2018 announcing that all current Sigma lenses work properly on the Nikon Z7 using Nikon’s FTZ mount adapter.
Thank you for purchasing and using our products.
We would like to announce that we have confirmed that SIGMA’s interchangeable lenses for Nikon mount in the current lineup do not have any issues with general operation when they are used on the “Z7”, released by Nikon Corporation, via their “Mount Adapter FTZ”.
In addition, please note the information below when using the following lenses.
Interchangeable lenses that do not incorporate an AF drive motor will operate only in manual focus.
Some interchangeable lenses shipped out before November 2013 that are not compatible with the latest DSLR cameras will not operate.
We will continue verification and provide updates on the operating conditions including discontinued models.
For further information, please contact your nearest authorized SIGMA subsidiary / distributor.
We appreciate your continued support for our company and products.
Tamron lens owners may not be as fortunate. Tamron just issued a statement warning that its lenses may not work correctly on a Nikon Z7 using the FTZ adapter.
Dear users and potential purchasers of Tamron interchangeable lenses.
Thank you for using Tamron products and for your continuous support.
We would like to announce that we have discovered issues that some of Tamron Di/Di II series for Nikon mount models may not operate properly on Nikon Z7, which was newly released on September 28, 2018, with Nikon Mount Adapter FTZ.
We are investigating the causes and will make further announcement of the compatibility for every single model once we find the solution.
It remains to be seen whether Tamron can work out the issues and bring full compatibility to its lineup. Otherwise, we may soon see a rash of Nikon photographers dumping their Tamron lenses on the used market in switching to the Z Series.