Another fun coincidence! I was actually giving ZbrushCore a serious attempt some time back by sculpting Ly's head. Has a very nice quality to it. I'm particularly fond of the nose I gave her.
So far from what I've seen, Zbrush is a very powerful tool and it excels at what it does, but unfortunately the pervasive limitations of Core became apparent very quickly. I was very excited to learn it had a remesh tool (basically creates low-poly models with good topology much faster, meaning I don't have to do it all manually), until I discovered the Core version of it is literally only a single button. No advanced options for things such as perserving sharp edges and other important details, so it's hard to get a good result.
Then, a friend pointed out to me that Blender can be a good alternative. I went and tried it for a little while. Blender's sculpting mode is definitely very competent, but I still think I may buy ZbrushCore again (I had requested a refund just in case Blender worked out for me, I was still on my 30-day money back guarantee) and look into saving up for Zbrush in full. It's just about $900 for a perpetual license, unless you own Core in which case about 180 is shaven off, but discovering how powerful Core is despite its limitations and the developers constantly improving on their software while keeping it all familiar and not shuffling everything around (looking at Blender here), I think it's worth the investment. In fact, having a tool this powerful has made me feel more confident about the possibility of offering 3D commissions. If I can get that off the ground, I may be able to afford Zbrush that much quicker.
Just, sculpting is really really fun. It makes me feel like I've rediscovered the fun of creating art again.