Hi Sofilu,
Latex is very “point elastic” and because of this larger motions only affect a smaller area around the point of compression than most other materials that are used in mattress comfort layers. In a way … it’s the pocket coil of the resilient foam world because each “area” of the mattress can flex more independently without affecting the area around it. Other than memory foam … latex is the most point elastic foam material and in this way is similar to memory foam although it has a “valley shaped” impression more than a more “canyon” shaped impression (steeper walls around the impression which means less of the surrounding area is affected) and is also a very resilient material and doesn’t absorb energy like memory foam so memory foam surface layers would be slightly better than latex in terms of motion isolation. There is more about latex vs memory foam in post #2 here.
While the only way to know whether any specific mattress would be “motion isolating enough” for those who are very sensitive … it would be fair to say that while you may know your partner is moving if you are awake … only a few more sensitive people would be affected by the motions of their partner when they are sleeping with a mattress that has latex comfort layers.
Phoenix