Pro tip: use an app such as QuickRes to switch the resolution to the native resolution of the display, such as 2880x1800 for the 15". When a video player is set to full-screen it will upscale much more sharply and precisely, and a good quality source will practically look like native 4K.
I uploaded a comparison of this here (native 2880x1800 vs the simulated 1440x900), using a music video from Tidal in surprisingly extremely high quality 1080p:
http://imgur.com/a/60kps
If you zoom in on the top and bottom images, the bottom is noticeably more pixelated than the sharp top image. Although this is much more noticeable in motion.
I uploaded a comparison of this here (native 2880x1800 vs the simulated 1440x900), using a music video from Tidal in surprisingly extremely high quality 1080p:
http://imgur.com/a/60kps
If you zoom in on the top and bottom images, the bottom is noticeably more pixelated than the sharp top image. Although this is much more noticeable in motion.
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