5120x2160:Note re: the 45" 5k/2k OLED. It's due out later this year in 39" which makes it a much more productivity-friendly 140ppi, which is the same as the current Dell and LG used by many. It's *also* due in 34" which will have an even higher PPI though I'm too lazy to do the math right now.
45" - 123.5 ppi - Minimum retina seating distance 27.8"
39" - 142.5 ppi - Minimum retina seating distance 24.1"
34" - 163.4 ppi - Minimum retina seating distance 21.0"
30" - 185.3 ppi - Minimum retina seating distance 18.6"
27" - 205.8 ppi - Minimum retina seating distance 16.7"
The first two sizes are non-starters for me. The 34" at 163 ppi would be OK, but I want an upgrade from my current 163 ppi monitor. As mentioned earlier, a hypothetical 30" monitor at 185 ppi would be great, but it's not on the roadmap.
I sit at around 22-25" away from the screen, which is why that 34" 5K2K monitor would work, with its minimum recommended seating distance of 21", but nonetheless with 163 ppi I still do notice text isn't quite perfectly crisp when non-integer scaling is used.
Thus, I will stick with the plan of getting a 5-6K 31.5-32" monitor.
5120x2880 31.5" - 186.5 ppi - Minimum retina seating distance 18.4"
6016x3384 31.5" - 219.1 ppi - Minimum retina seating distance 15.7"
6144x3456 32.0" - 220.3 ppi - Minimum retina seating distance 15.6"
BTW, here are the Asus 6K specs. Technically it says 218 ppi (like Apple's monitors). Rounding error above, but close enough.
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