With 4K grafts I would expect a little better result. It's good that the hairline is thick, that implies a good graft survival rate, so the extraction method is solid, at least for single hair grafts. I guess the focus was to repair the hairline and the front view from horizontal angles with single hair grafts. To me the hairline looks a little too perfect, but not bad.
Has anything been transplanted on the top?
If there have been any bigger 2-4 hair grafts placed on top, I think they didn't survive.