I'm pretty sure your 4K is 28 inches, not 27 inches. 4K 27 inch panels don't exist. That still puts you at 157PPI though. Edit: it looks like 27 inch is really

I'm pretty sure your 4K is 28 inches, not 27 inches. 4K 27 inch panels don't exist. That still puts you at 157PPI though. Edit: it looks like 27 inch is really a thing now and not some sort of labelling trick: Monitor Size (Diagonal) Width (approx.) Height (approx.) Width (Metric) Height (Metric) 27-inch (26.9" actual) 23.5 inches 13.2 inches 59.7 cm 33.6 cm 28-inch (27.9" actual) 24.45 inches 13.43 inches 62.09 cm 34.13 cm