No, Zcash activated sapling last year along with Versacoin. As far as I know Litecoinz has sapling ready, but I'm not sure if it's activated. Snowgem released sapling binaries after Zero, but went with a shorter adoption window and activated before Zero. Zelcore I believe was scheduled to activate a few days ago, but I didn't follow the progress. Also I think Hush activated sapling, but I could be wrong. I don't think zclassic has released binaries or activated it yet. Komodo is either very close or already active based on what I saw in there github, but I don't follow them that closely.

Don't quote me on any of this, I don't follow these projects religiously, but to answer your question the entire family is in the process of moving to sapling and Zero was among the first few to get there.