Thank you for appreciating my post. I had lots of fun making it. Sculpting is a joy to do, even in Blender, where I practiced a lot before jumping back into re-learning ZBrush.

And to answer your question, ZBrush was built from the ground up to be a sculpting and painting app, and is highly optimized for extremely-high polygon work.

It's not uncommon to hear of artists say their sculpts have 10 million polys, or even higher. As for Blender, once I get to the million mark, it starts to slow down, sometimes even crashing. But I know they are fixing it in 2.80. We'll see when the final gets released. 🙂