Some interesting findings:
Comparing either native factory preset modes or NEC puck+SV II calibrations of the NEC PA241W and the metamerism switch on off to a Samsung 244T (standard gamut) calibrated with DTP94b+CEDP the two displays didn't match. Large solid patches of various grays looked pretty different and even in some photos you could see a difference an evening lit orange-brown cliffside had a reddish cast on one and a more yellow-orange cast on the other.
So then I loaded up multiprofiler and loaded the SVII profile and then turned on the metamerism switch (SVII doesn't have a toggle to turn on metamerism so you need to use multiprofiler also) and then things started to look a lot closer to how the Samsung sRGB monitor looked, although they were still a bit off. The SVII+NEC puck version looked a bit closer to the Samsung than the factory preset sRGB mode in terms of the gray scale tint.
So it seems like SVII+NEC puck may well improve upon factory preset white point and that metamerism toggle should probably be always left on (multiview does ship with metamerism toggled on as a default it should be noted too). So it seems like the eye really does not see a wide gamut display the same way as a standard gamut one and that the differences can be quite noticeable, definitely enough to bothersome without applying at least some correction. This makes me wonder about all those somewhat lower end Dell and HP that as far as I know don't have a metarmerism or 10 degree calibration choice. Might stuff editing on them not match when viewed on other displays? Only Eizo and NEC support that (NEC calls it metamerism and Eizo 10 degree view calibration) right? Not even stuff like iColor or CEDP??? Or maybe they do? If they don't then doesn't it get weird when you edit on say an HP 2475 or Dell U2410 and then view on an sRGB display or a NEC or Eizo with correction turned on??
BUT of course I used different software and different puck on each, so that could explain as much or more than metamerism.
So first I went back and calibrated the Samsung using NEC puck+CEDP this time (on NEC's site they claim their special wide gamut i1D2 works fine with third party software if used on sRGB monitors only). The result was pretty bad looking. The Samsung suddenly had a noticeable red cast. The Samsung+DTP+CEDP looked MUCH closer to the NEC+SVII+NEC than the Samsung+NEC+CEDP did!
I know on another thread here it had been said that an off the shelf i1D2 tended to under read the amount of blue present and I also see someone else reporting here today that an off the shelf i1D2 made both his wide and standard gamut monitors look red.
It seems like the NEC puck is NOT calibrated to some perfect sRGB response standard but perhaps to some average i1D2 response (maybe so those with off the shelf copies can at least give them a shot with SVII), either that or so much for the claims (not that I care so much) that the NEC version will work fine using third party software if used on standard gamut displkays. And it seems like the i1D2, in general, may well produce rather red calibrations? At least more recent copies?
When used with SVII on a NEC PA I don't notice any read cast whatsoever from the NEC puck though.
Anyway, so far, NEC PA+SVII+NEC puck+metamerism toggle and Samsung 244t sRGB+DTP94b+CEDP produces the closest match. It's still not quite the same looking though. Same thing when I compared that NEC PA combo with a samsung hdtv that has been calibrated with a DTP94b too. Of course how much of this is due to the metamerism not being perfectly corrected for and how much has to do with the fact that different software and pucks were used on both is hard to say, that certainyl could account for it all, perhaps if a spectrophotometer was used on both having metamerism toggle off would even be closer (but probably not).
I hope to get a chance to give the samsung (and perhaops nec) a quick calibration with an i1Pro, would be interesting to see what happens then.
For now I would tentatively suggest using a puck to calibrate the NEC PA with SVII rather than factory preset and NOT using the NEC puck to calibrate any displays and to keeping the metamerism toggle on as the best bet. (EDIT: see post below!)
I will see what happens if I get to try an i1Pro. That may every well change the findings, since there have been some claims that the DTP itself, while having good inter agreement, have a bit of a white point bias of their own.