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pentile is no replacement for true high res dpi. it may compare favorably to the current ipad's display resolution, but nowhere near a 2048×1536 ips display.

we've been down this road before: http://www.mobiletechworld.com/2010/06/24/iphone-4-retina-display-vs-samsung-galaxy-s-super-amoled/
Here’s a quick comparison between the iPhone 4′s Retina Display and the Samsung Galaxy S’s super AMOLED. The first thing you will notice is the PenTile Matrix sub-pixels arrangement on the Super AMOLED which make the panel look really inferior to the IPS LCD on the iPhone 4.
 
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