With QuickRes it works like you desire. Without QuickRes it looks like a standard iMac, as far as window/text size. I'm going to try and attach an image showing the different sizes: 2560 x 1440 (EIAS on normal Retina iMac); 3200 x 1800 (QuickRes setting); 6400 x 3600 (highest QuickRes setting).
Some things to note:
-- In the jpg image, each of the three project windows vertically fill the 27 inch iMac display.
-- At 6400 x 3600 the project window text is too small for my eyes. I can move closer and make it out but would have a headache within minutes.
-- Mouse pointer speed would have to be increased as it becomes slower at higher screen resolution.
-- QuickRes offers other sizes in between what I have displayed here. I preferred 3200 or 3800 (horizontal resolution). Much higher and in my opinion text is too small.
-- I bought the iMac for processor speed, but the screen is excellent and better than expected.
Image file too big to attach. Link: http://ziccardiproductions.com/EIAS_retina_iMac.jpg
Be sure to download and view at 1:1 or 100% :shy: