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Yeah, you cannot get better then retina! That a made up Apple marketing term. Go to your eye doctor and tell him/her about retina and see their face expressions! LOL!
 
It should also be noted that Apple defines "Retina" differently depending upon if it's an iPad, MacBook or MacBook Pro, iMac, or iPhone.
 
To those saying battery life is the reason for a lower ppi since higher requires more processing power: since you can change the resolution on Samsung phones anyone can test this, the difference in battery life is like 15-20 minutes throughout the day so really IMO not a legit excuse.
 
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