I have always been in the lumen camp. Me, a lumen whore? Guilty… 0:)
I just happen to be a tint and CRI snob as well who often prefer slightly warmer tints. Not a big fan of the “CW” side of NW… But they have a purpose.
I doubt you would see much difference on pictures. A real life comparison would be needed anyway IMO.
I have done some comparisons with the Nichia 119 vs some XM-Ls when I did my personal low budget Sipik SK68 high CRI emitter on copper challenge.
That is supposed to be 92 CRI. Not much difference between that on WW XM-L that should be 80-CRI in terms of CRI on the pictures.
I don’t think its possible to dislike the XM-L2s T4 5B1s with 80CRI minium… Its certainly worth a shot!
Compared to XM-L T5 5C, I would say the light is more natural. Just nice quality light. I really like the normal 5C (75-CRI typical) with similar tint too. But this light is just that little extra when it comes to CRI, which makes a difference for the CRI-snobs… 
I also thinks it makes easier to like for those who swear to 4500K.
Its the highest CRI NW XM-L2 there is! Its certainly worth a shot if you are looking for high output combined with quality light.
Im looking forward to compare them with the slightly warmer XM-L2 T3 6A1, also 80-CRI minium.