I've owned both and the difference is not the frontlight but Carta vs. Pearl. H2O blacks are blacker and whites are whiter. The difference is really pretty clear.
In the rest of specs and behavior they are just the same. Screen sharpness is the same, speed is the same, touch response is the same. Only contrast is clearly improved.
But if you don't mind expending (quite) some money and if you continually use it, you won't regret the upgrade.
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