Actually, all 4th Gen meshes ARE pretty much HD compared to the newer figures:

V4  66,830

Genesis  18,872

G2F  21,098

G3F  17,000

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The MorphBrush actually CAN do create decent HD morphs, but it starts to run out of memory once yousubdivide too often

I DO LOVE the MorphBrush already AS IS, but improving it would have been way, way higher on my priority list for a better Poser than trying to shoehorn a freebie render engine into Poser's ancient code.

If the MorphBrush were (almost) as powerfull as Z-Brush, think of the things we could do with even the most ancient Poser meshes.

I already now can rig Posette in a way that would make G9 look like a stick figure.

Think what could be done with a Z-Brush like MorphBrush, everything fully integrated into Poser.

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But let's not forget that there are also hardly any good Poser artists left that are able to create good HD morphs.

Those who do, went over to DAZ long ago, because working with Genesis is a lot more profitable.

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So, back to V4: She'd be actually be too high polygon already for HD morphs. BUT the 17K versions would be pretty much ideal for such an undertaking.