Hi gcrain,
I haven’t slept on any of the Christeli mattresses and done a side by side comparison with any of the Tempurpedic mattresses so I don’t know how they are similar or different in their response but there is more about how the hundreds of different types of memory foam can be chemically formulated to have different properties and differ from each other (regardless of density) in post #9 here and in post #8 here.
Phoenix