Most of us are not just patients or perspective patients on this site, thanks to the members that share vital information, we have become uber informed patients. Although much is still unknown to us, the knowledge that is shared on here goes well above what someone could find on a mainstream site like RealSelf. Of course, RealSelf is a business but I couldn't think of a good comparison.
After seeing everything that has been posted on here about HA and also talking to people who have actually had it on the jaw and cheeks, I think I can say that if you would not be happy with Radiesse for cheek augmentation (not saying that is the same as HA but it will give the same aesthetic result in my opinion) then how could you even contemplate HA for zygomatic arch or any part of the malar area? Fat, filler, HA, pretty much the same nondescript shape sort of results in my opinion.
I think it should be fine for a bit of brow augmentation.