This post examines the number of WZ players titles compared to the whole of the ICCF, by looking at the list for 2020/2. The comparison shows that the WZ has a very similar profile of ICCF titles than the whole of the ICCF combined.
There is a similar level of GM, SIM, IM, CCM and CCE in the WZ with only the SIM difference being 3%. The other categories are only different by 1%. The only exception to this is the non titled players (NA) that are 63% for the WZ compared to the whole ICCF that are 55%, a difference of 8%. Below is the table with the actual numbers and percentages.