I am not an expert, but here goes.... the wingmast is not as "fat" (from beam to beam when mast rotation is 0), allowing for a smoother transition to soft sail. To make up for the lack of "fatness", the shape is "deeper" (from bow to stern when mast rotation is at 0).

I assume the smoother transition to sail allows for better wind flow and better use of a higher percentage of the sail area (i.e. the frst few inches of sail from the mast). The wing mast also seem to be more "bendier" in the important axis that allows sail shape to be more controllable.....

I have a photo that shows the depth of the Blade wingmast versus a H16 and stock Nacra 18 Square. It is also a good comparison of old sail cut versus new sail cut.... however; I am an idiot and cannot figure out how to attach a picture that is not already on a web site....

Your N5.2 has a tear drop mast, so picture a mast skinnier, but deeper. More bendy from side to side, less bendy front to back. Maybe?

Experts: please correct...