The Foundry has released on early access a sculpting tool called Kanova. I suspect it will soon jump ahead of other early VR sculpting tools–just based on the resources of the Foundry versus other early entrants.
I anticipate that Maxon will be moving into this space sometime over the next 18 months.
Update: I played with it for 10 minutes. Currently the tool set is pretty limited. There aren’t any stamps or stencils for instance. I was impressed with the feel of it and the resolution.
One thing I’ve yet to see in any VR sculpting or painting tool (I’ve had limited exploration) is the ability to view reference images while working. For someone like me this would be huge and that doesn’t seem like it would be hard at all for developers to provide.