missing the point
No, the Dell does not have better colour gamut. The Dell and Apple appear to actually be using the same panel. You cannot buy a better monitor at close to the price. You can get similar monitors for a similar price (and very few at that) or a better one for a lot more.
All in all it's pretty cool that you can now get a monitor that doesn't replicate your ports but gives you all new ones on their own high speed bus with a simple tiny serial cable connection, that is then mirrored on the monitor!!! While everyone is arguing about whether it's overpriced or is a good monitor they missed the whole point. It does something no other monitor has ever done in the past.