Unlike some Windows PCs with higher-res screens, OS X is more interested in scaling your onscreen content to look its best (or what Apple thinks will look best), rather than giving you full unfettered access to that very, very high resolution. The flagship MacBook Pro retains its very high screen resolution, which results in crisper text and clearer photos (2,560x1,600 pixels for the 13-inch model, 2,880x1,800 for the 15-inch model). For the sake of expediency, we'll now refer to the current 13-inch and 15-inch Retina Display models simply as the MacBook Pro. The 15-inch version is presumably relegated to the same lonely afterlife as its long-gone 17-inch relative. Currently only the 13-inch version of the 'classic' MacBook Pro is still for sale. Note, however, that this CPU update applies only to the thinner MacBook Pro models with Retina Displays.
