Various Nichia comes in different tints, bins, and with different CRI.
The older 219A with 92 CRI and around 4500K have been the benchmark and what most think of then mentioning Nichia emitters. But its just one out of a "ton" of different Nichia emitters, most of which are nothing special. Its become popular due to its unique combo of very high CRI (92), desirable color temperature 4500K and overall good tint. Something CREE does not offer in the 4500K range.
The issue as far as I have seen is that Kaidoman have gotten various of newer Nichias and with different tints, and who knows what CRI. Makes things more confusing. Especially due to Kaidomains ability to just slap "top bin" on everything they get in stock. On top of that, they also mixed up specs it seemed.
It does not mean you get bad emitters, it just means its harder for people to know what they are buying, and it may not be the best out there or what they expect it to be.
Luckily intl-outdoor now have the latest 219BT with 92 CRI and 4500K.
Just arrived, and on Noctigon.
http://intl-outdoor.com/led-nichia-c-107_140.html
(thanks to djozz for notifying here)