Honestly if you put me in front of a bunch of games I didn't know and ask me to guess I doubt my old eyes could tell between 900 and 1080.
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Most people can't.. and that is why 900p is a great compromise if you can't get 1080p.
The Order 1866 looks fantastic, but will have black bars and 800p res.... it doesn't matter to me, the game LOOKS phenominal regardless of the paper numbers.