I got the EIZO CS2740 today. Very uneventful hookup to the MP 5,1. Everything works and checks out. The Radeon RX560 handles the 2560x1440 @60Hz resolution well. Only noticeable performance impact is a rise in the expansion slot fan when playing video; audible but not too much from the MacPro case under my desk. No other performance impacts such as sluggish mouse or desktop animations.
Connected via Display Port. Initial boot into Mohave had default res at 1920x1080; changed to 2560x1440 and, voila, beautiful crisp text and spectacular color. The monitor and Mac OS system report 10-bit color. USB hub works; Color Navigator calibration software finds iDisplay Pro colorimeter and works flawlessly. Great screen uniformity and no faulty pixels. Excellent ergonomic stand. High quallity USB-C, USB-B and Display Port cables included. Calibration certificate included and "Made in Japan."
This monitor with 164 ppi may not qualify as retina, but I sure do not see any pixels from the approx 24-34 inches I sit from the monitor. But since my old NEC was only 89 ppi pretty easy to appreciate 164.
This is the kind of quality you expect and pay for with an EIZO. I highly recommend.
PS: In case anyone is interested this is a spectacular, detailed review of the EIZO CS2740 by a dealer in Australia:
https://imagescience.com.au/blog/eizo-cs2740-evaluation